diff --git a/collects/framework/preferences.rkt b/collects/framework/preferences.rkt
index 25bd438b..9c74cff4 100644
--- a/collects/framework/preferences.rkt
+++ b/collects/framework/preferences.rkt
@@ -244,7 +244,7 @@ the state transitions / contracts are:
           (pref-can-init? p))
      (let ([default-okay? (checker default-value)])
        (unless default-okay?
-         (error 'set-default "~s: checker (~s) returns ~s for ~s, expected #t~n"
+         (error 'set-default "~s: checker (~s) returns ~s for ~s, expected #t\n"
                 p checker default-okay? default-value)))
 
      (unless (= (length aliases) (length rewrite-aliases))
diff --git a/collects/framework/private/color-model.rkt b/collects/framework/private/color-model.rkt
index 9a45c779..a18e0152 100644
--- a/collects/framework/private/color-model.rkt
+++ b/collects/framework/private/color-model.rkt
@@ -192,7 +192,7 @@
                                          (,(xyz-z xyz-white))))])
       (apply values (car (transpose sigmas)))))
   
-  ;; (printf "should be equal to xyz-white: ~n~a~n"
+  ;; (printf "should be equal to xyz-white: \n~a\n"
   ;;    (matrix-multiply pre-matrix `((,sigma-r) (,sigma-g) (,sigma-b))))
   
   (define rgb->xyz-matrix
@@ -203,13 +203,13 @@
   (define xyz->rgb-matrix
     (matrix-invert rgb->xyz-matrix))
   
-  ;;(printf "should be identity: ~n~a~n" (matrix-multiply rgb->xyz-matrix xyz->rgb-matrix))
+  ;;(printf "should be identity: \n~a\n" (matrix-multiply rgb->xyz-matrix xyz->rgb-matrix))
   
   (define (rgb->xyz r g b)
     (apply make-xyz (car (transpose (matrix-multiply rgb->xyz-matrix (transpose `((,r ,g ,b))))))))
   
   ;;(print-struct #t)
-  ;; (printf "should be xyz-white: ~n~a~n" (rgb->xyz 255 255 255))
+  ;; (printf "should be xyz-white: \n~a\n" (rgb->xyz 255 255 255))
   
   (define (xyz->rgb x y z)
     (car (transpose (matrix-multiply xyz->rgb-matrix (transpose `((,x ,y ,z)))))))
diff --git a/collects/framework/private/color.rkt b/collects/framework/private/color.rkt
index 281844f3..25ee0731 100644
--- a/collects/framework/private/color.rkt
+++ b/collects/framework/private/color.rkt
@@ -286,7 +286,7 @@ added get-regions
                        (enable-suspend #t)))])
         (unless (eq? 'eof type)
           (enable-suspend #f)
-          #; (printf "~a at ~a to ~a~n" lexeme (+ in-start-pos (sub1 new-token-start))
+          #; (printf "~a at ~a to ~a\n" lexeme (+ in-start-pos (sub1 new-token-start))
                      (+ in-start-pos (sub1 new-token-end)))
           (let ((len (- new-token-end new-token-start)))
             (set-lexer-state-current-pos! ls (+ len (lexer-state-current-pos ls)))
@@ -418,11 +418,11 @@ added get-regions
     
     (define/private (colorer-driver)
       (unless (andmap lexer-state-up-to-date? lexer-states)
-        #;(printf "revision ~a~n" (get-revision-number))
+        #;(printf "revision ~a\n" (get-revision-number))
         (unless (and tok-cor (= rev (get-revision-number)))
           (when tok-cor
             (coroutine-kill tok-cor))
-          #;(printf "new coroutine~n")
+          #;(printf "new coroutine\n")
           (set! tok-cor
                 (coroutine
                  (λ (enable-suspend)
@@ -450,19 +450,19 @@ added get-regions
                                (format "exception in colorer thread: ~s" exn)
                                exn))
                             (set! tok-cor #f))))
-          #;(printf "begin lexing~n")
+          #;(printf "begin lexing\n")
           (when (coroutine-run 10 tok-cor)
             (for-each (lambda (ls)
                         (set-lexer-state-up-to-date?! ls #t))
                       lexer-states)))
-        #;(printf "end lexing~n")
-        #;(printf "begin coloring~n")
+        #;(printf "end lexing\n")
+        #;(printf "begin coloring\n")
         ;; This edit sequence needs to happen even when colors is null
         ;; for the paren highlighter.
         (begin-edit-sequence #f #f)
         (color)
         (end-edit-sequence)
-        #;(printf "end coloring~n")))
+        #;(printf "end coloring\n")))
     
     (define/private (colorer-callback)
       (cond
@@ -643,7 +643,7 @@ added get-regions
     ;; possible.
     (define/private match-parens
       (lambda ([just-clear? #f])
-        ;;(printf "(match-parens ~a)~n" just-clear?)
+        ;;(printf "(match-parens ~a)\n" just-clear?)
         (when (and (not in-match-parens?)
                    ;; Trying to match open parens while the
                    ;; background thread is going slows it down.
@@ -918,21 +918,21 @@ added get-regions
          (let* ((x null)
                 (f (λ (a b c) (set! x (cons (list a b c) x)))))
            (send (lexer-state-tokens ls) for-each f)
-           (printf "tokens: ~.s~n" (reverse x))
+           (printf "tokens: ~.s\n" (reverse x))
            (set! x null)
            (send (lexer-state-invalid-tokens ls) for-each f)
-           (printf "invalid-tokens: ~.s~n" (reverse x))
-           (printf "start-pos: ~a current-pos: ~a invalid-tokens-start ~a~n"
+           (printf "invalid-tokens: ~.s\n" (reverse x))
+           (printf "start-pos: ~a current-pos: ~a invalid-tokens-start ~a\n"
                    (lexer-state-start-pos ls)
                    (lexer-state-current-pos ls)
                    (lexer-state-invalid-tokens-start ls))
-           (printf "parens: ~.s~n" (car (send (lexer-state-parens ls) test)))))
+           (printf "parens: ~.s\n" (car (send (lexer-state-parens ls) test)))))
        lexer-states))
     
     ;; ------------------------- Callbacks to Override ----------------------
     
     (define/override (lock x)
-      ;;(printf "(lock ~a)~n" x)
+      ;;(printf "(lock ~a)\n" x)
       (super lock x)
       (when (and restart-callback (not x))
         (set! restart-callback #f)
@@ -940,25 +940,25 @@ added get-regions
     
     
     (define/override (on-focus on?)
-      ;;(printf "(on-focus ~a)~n" on?)
+      ;;(printf "(on-focus ~a)\n" on?)
       (super on-focus on?)
       (match-parens (not on?)))
     
     (define/augment (after-edit-sequence)
-      ;;(printf "(after-edit-sequence)~n")
+      ;;(printf "(after-edit-sequence)\n")
       (when (has-focus?)
         (match-parens))
       (inner (void) after-edit-sequence))
     
     (define/augment (after-set-position)
-      ;;(printf "(after-set-position)~n")
+      ;;(printf "(after-set-position)\n")
       (unless (local-edit-sequence?)
         (when (has-focus?)
           (match-parens)))
       (inner (void) after-set-position))
     
     (define/augment (after-change-style a b)
-      ;;(printf "(after-change-style)~n")
+      ;;(printf "(after-change-style)\n")
       (unless (get-styles-fixed)
         (unless (local-edit-sequence?)
           (when (has-focus?)
@@ -966,19 +966,19 @@ added get-regions
       (inner (void) after-change-style a b))
     
     (define/augment (on-set-size-constraint)
-      ;;(printf "(on-set-size-constraint)~n")
+      ;;(printf "(on-set-size-constraint)\n")
       (unless (local-edit-sequence?)
         (when (has-focus?)
           (match-parens)))
       (inner (void) on-set-size-constraint))
     
     (define/augment (after-insert edit-start-pos change-length)
-      ;;(printf "(after-insert ~a ~a)~n" edit-start-pos change-length)
+      ;;(printf "(after-insert ~a ~a)\n" edit-start-pos change-length)
       (do-insert/delete edit-start-pos change-length)
       (inner (void) after-insert edit-start-pos change-length))
     
     (define/augment (after-delete edit-start-pos change-length)
-      ;;(printf "(after-delete ~a ~a)~n" edit-start-pos change-length)
+      ;;(printf "(after-delete ~a ~a)\n" edit-start-pos change-length)
       (do-insert/delete edit-start-pos (- change-length))
       (inner (void) after-delete edit-start-pos change-length))
     
diff --git a/collects/framework/private/editor.rkt b/collects/framework/private/editor.rkt
index 3c0b3537..0c8981b6 100644
--- a/collects/framework/private/editor.rkt
+++ b/collects/framework/private/editor.rkt
@@ -242,10 +242,10 @@
            (unless (and (procedure? t)
                         (= 0 (procedure-arity t)))
              (error 'editor:basic::run-after-edit-sequence
-                    "expected procedure of arity zero, got: ~s~n" t))
+                    "expected procedure of arity zero, got: ~s\n" t))
            (unless (or (symbol? sym) (not sym))
              (error 'editor:basic::run-after-edit-sequence
-                    "expected second argument to be a symbol or #f, got: ~s~n"
+                    "expected second argument to be a symbol or #f, got: ~s\n"
                     sym))
            (if (refresh-delayed?)
                (if in-local-edit-sequence?
diff --git a/collects/framework/private/gen-standard-menus.rkt b/collects/framework/private/gen-standard-menus.rkt
index 120799bb..7e603022 100644
--- a/collects/framework/private/gen-standard-menus.rkt
+++ b/collects/framework/private/gen-standard-menus.rkt
@@ -125,7 +125,7 @@
   (write-docs))
 
 (define (write-docs)
-  (printf "writing to ~a~n" docs-menus.ss-filename)
+  (printf "writing to ~a\n" docs-menus.ss-filename)
   (call-with-output-file docs-menus.ss-filename
     (λ (port)
       (define (pop-out sexp)
@@ -203,7 +203,7 @@
     #:exists 'truncate))
 
 (define (write-standard-menus.rkt)
-  (printf "writing to ~a~n" standard-menus.rkt-filename)  
+  (printf "writing to ~a\n" standard-menus.rkt-filename)  
 
   (call-with-output-file standard-menus.rkt-filename
     (λ (port)
diff --git a/collects/framework/private/panel.rkt b/collects/framework/private/panel.rkt
index cfadd9d6..c2efa530 100644
--- a/collects/framework/private/panel.rkt
+++ b/collects/framework/private/panel.rkt
@@ -44,7 +44,7 @@
                       [(left top) 0]
                       [(right bottom) (- total-size item-size)]
                       [else (error 'place-children
-                                   "alignment spec is unknown ~a~n" spec)])))])
+                                   "alignment spec is unknown ~a\n" spec)])))])
             (map (λ (l) 
                    (let*-values ([(min-width min-height h-stretch? v-stretch?)
                                   (apply values l)]
diff --git a/collects/framework/private/preferences.rkt b/collects/framework/private/preferences.rkt
index 03de7025..c1cddf1f 100644
--- a/collects/framework/private/preferences.rkt
+++ b/collects/framework/private/preferences.rkt
@@ -528,7 +528,7 @@ the state transitions / contracts are:
                    (cond
                      [(string? default) string?]
                      [(number? default) number?]
-                     [else (error 'internal-error.set-default "unrecognized default: ~a~n" default)]))
+                     [else (error 'internal-error.set-default "unrecognized default: ~a\n" default)]))
                   (preferences:add-callback 
                    name 
                    (λ (p new-value)
diff --git a/collects/framework/splash.rkt b/collects/framework/splash.rkt
index affbc869..0357046f 100644
--- a/collects/framework/splash.rkt
+++ b/collects/framework/splash.rkt
@@ -123,12 +123,12 @@
       [(or (path? splash-draw-spec)
            (string? splash-draw-spec))
        (unless (file-exists? splash-draw-spec)
-         (fprintf (current-error-port) "WARNING: bitmap path ~s not found~n" splash-draw-spec)
+         (fprintf (current-error-port) "WARNING: bitmap path ~s not found\n" splash-draw-spec)
          (no-splash))
        
        (set! splash-bitmap (make-object bitmap% splash-draw-spec))
        (unless (send splash-bitmap ok?)
-         (fprintf (current-error-port) "WARNING: bad bitmap ~s~n" splash-draw-spec)
+         (fprintf (current-error-port) "WARNING: bad bitmap ~s\n" splash-draw-spec)
          (no-splash))
        
        (send splash-canvas min-width (send splash-bitmap get-width))
diff --git a/collects/framework/test.rkt b/collects/framework/test.rkt
index 2fc91530..9129bbd7 100644
--- a/collects/framework/test.rkt
+++ b/collects/framework/test.rkt
@@ -363,7 +363,7 @@
                           (loop (- n 1))))])))]
        [(number? state)
         (unless (send rb is-enabled? state)
-          (error 'test:set-radio-box! "item ~a is not enabled~n" state))
+          (error 'test:set-radio-box! "item ~a is not enabled\n" state))
         (send rb set-selection state)]
        [else (error 'test:set-radio-box!
                     "expected a string or a number as second arg, got: ~e (other arg: ~e)"
diff --git a/collects/tests/gracket/item.rkt b/collects/tests/gracket/item.rkt
index f9ff3383..40be32ba 100644
--- a/collects/tests/gracket/item.rkt
+++ b/collects/tests/gracket/item.rkt
@@ -133,7 +133,7 @@
 		      (if (not l)
 			  win
 			  l)))])
-	(when noisy? (printf "~a~n" s))
+	(when noisy? (printf "~a\n" s))
 	(send m set-label (substring s 0 (min 200 (string-length s))))))))
 
 (define (add-click-intercept frame panel)
@@ -146,7 +146,7 @@
 	  (make-object menu-item% (format "Click on ~a" win)
 		       m (lambda (i e)
 			   (unless (eq? (send m get-popup-target) win)
-			     (printf "Wrong owner!~n"))))
+			     (printf "Wrong owner!\n"))))
 	  (send win popup-menu m 
 		(inexact->exact (send e get-x))
 		(inexact->exact (send e get-y)))
@@ -160,7 +160,7 @@
 	[cc (make-object cursor% 'cross)])
     (make-object check-box% "Control Bullseye Cursors" panel
 		 (lambda (c e)
-		   (printf "~a~n" e)
+		   (printf "~a\n" e)
 		   (if (send c get-value)
 		       (set! old 
 			     (map (lambda (b) 
@@ -200,7 +200,7 @@
     (override
       [on-demand
        (lambda ()
-	 (printf "Menu item ~a demanded~n" name))])
+	 (printf "Menu item ~a demanded\n" name))])
     (sequence
       (apply super-init name args))))
 
@@ -239,7 +239,7 @@
 							       (memq (send e get-event-type)
 								     '(menu-popdown menu-popdown-none)))
 						    (error "bad event object"))
-						  (printf "popdown ok~n")))]
+						  (printf "popdown ok\n")))]
 				[make-callback 
 				 (let ([id 0])
 				   (lambda ()
@@ -297,7 +297,7 @@
     (sequence
       (apply super-init args)
       (unless (ok?)
-	(printf "bitmap failure: ~s~n" args)))))
+	(printf "bitmap failure: ~s\n" args)))))
 
 (define (active-mixin %)
   (class %
@@ -312,9 +312,9 @@
                [on-subwindow-char (lambda args 
                                     (or (apply pre-on args)
                                         (super on-subwindow-char . args)))]
-               [on-activate (lambda (on?) (printf "active: ~a~n" on?))]
-               [on-move (lambda (x y) (printf "moved: ~a ~a~n" x y))]
-               [on-size (lambda (x y) (printf "sized: ~a ~a~n" x y))])
+               [on-activate (lambda (on?) (printf "active: ~a\n" on?))]
+               [on-move (lambda (x y) (printf "moved: ~a ~a\n" x y))]
+               [on-size (lambda (x y) (printf "sized: ~a ~a\n" x y))])
     (public* [set-info
               (lambda (ep)
                 (set! pre-on (add-pre-note this ep))
@@ -331,10 +331,10 @@
     (override
       [on-superwindow-show
        (lambda (on?)
-	 (printf "~a ~a~n" name (if on? "show" "hide")))]
+	 (printf "~a ~a\n" name (if on? "show" "hide")))]
       [on-superwindow-enable
        (lambda (on?)
-	 (printf "~a ~a~n" name (if on? "on" "off")))])
+	 (printf "~a ~a\n" name (if on? "on" "off")))])
     (sequence
       (apply super-init name args))))
 
@@ -952,7 +952,7 @@
 	     (compare expect v (format "label search: ~a" string))))]
 	[tell-ok
 	 (lambda ()
-	   (printf "ok~n"))])
+	   (printf "ok\n"))])
       (private-field
 	[temp-labels? #f]
 	[use-menubar? #f]
@@ -1180,7 +1180,7 @@
     (unless (memq type types)
       (error (format "bad event type: ~a" type))))
   (unless silent?
-    (printf "Callback Ok~n")))
+    (printf "Callback Ok\n")))
 
 (define (instructions v-panel file)
   (define c (make-object editor-canvas% v-panel))
@@ -1216,7 +1216,7 @@
 			    (lambda (e)
 			      (check-callback-event b b e commands #t))
 			    old-list)
-			   (printf "All Ok~n"))))
+			   (printf "All Ok\n"))))
   (define e (make-object button%
 			 "Disable Test" p
 			 (lambda (c e)
@@ -1227,7 +1227,7 @@
 			     (thread (lambda () (sleep 0.5) (semaphore-post sema)))
 			     (yield sema)
 			     (when hit?
-			       (printf "un-oh~n"))
+			       (printf "un-oh\n"))
 			     (send b enable #t)))))
   (instructions p "button-steps.txt")
   (send f show #t))
@@ -1261,7 +1261,7 @@
 			    (lambda (e)
 			      (check-callback-event cb cb e commands #t))
 			    old-list)
-			   (printf "All Ok~n"))))
+			   (printf "All Ok\n"))))
   (instructions p "checkbox-steps.txt")
   (send f show #t))
 
@@ -1333,7 +1333,7 @@
 		  (lambda (rbe)
 		    (check-callback-event (car rbe) (car rbe) (cdr rbe) commands #t))
 		  old-list)
-		 (printf "All Ok~n")))
+		 (printf "All Ok\n")))
   (instructions p "radiobox-steps.txt")
   (send f show #t))
 
@@ -1360,12 +1360,12 @@
       (cond
        [(eq? (send e get-event-type) 'list-box-dclick)
 	; double-click
-	(printf "Double-click~n")
+	(printf "Double-click\n")
 	(unless (send cx get-selection)
 	  (error "no selection for dclick"))]
        [else
 	; misc multi-selection
-	(printf "Changed: ~a~n" (if list?
+	(printf "Changed: ~a\n" (if list?
 				    (send cx get-selections)
 				    (send cx get-selection)))])
       (check-callback-event c cx e commands #f)))
@@ -1402,7 +1402,7 @@
 	       (make-object button%
 			    "Visible Indices" p
 			    (lambda (b e)
-			      (printf "top: ~a~nvisible count: ~a~n"
+			      (printf "top: ~a\nvisible count: ~a\n"
 				      (send c get-first-visible-item)
 				      (send c number-of-visible-items))))))
   (define cdp (make-object horizontal-panel% p))
@@ -1555,9 +1555,9 @@
 			     (lambda (e)
 			       (check-callback-event c c e commands #t))
 			     old-list)
-			    (printf "content: ~s~n" actual-content)
+			    (printf "content: ~s\n" actual-content)
 			    (when multi?
-			      (printf "selections: ~s~n" (send c get-selections))))))
+			      (printf "selections: ~s\n" (send c get-selections))))))
   (send c stretchable-width #t)
   (instructions p "choice-list-steps.txt")
   (send f show #t))
@@ -1570,7 +1570,7 @@
   (define s (make-object slider% "Slide Me" -1 11 p
 			 (lambda (sl e)
 			   (check-callback-event s sl e commands #f)
-			   (printf "slid: ~a~n" (send s get-value)))
+			   (printf "slid: ~a\n" (send s get-value)))
 			 3))
   (define c (make-object button% "Check" p
 			 (lambda (c e)
@@ -1578,7 +1578,7 @@
 			    (lambda (e)
 			      (check-callback-event s s e commands #t))
 			    old-list)
-			   (printf "All Ok~n"))))
+			   (printf "All Ok\n"))))
   (define (simulate v)
     (let ([e (make-object control-event% 'slider)])
       (send s set-value v)
@@ -1634,13 +1634,13 @@
   (define (handler get-this)
     (lambda (c e)
       (unless (eq? c (get-this))
-	(printf "callback: bad item: ~a~n" c))
+	(printf "callback: bad item: ~a\n" c))
       (let ([t (send e get-event-type)])
 	(cond
 	 [(eq? t 'text-field)
-	  (printf "Changed: ~a~n" (send c get-value))]
+	  (printf "Changed: ~a\n" (send c get-value))]
 	 [(eq? t 'text-field-enter)
-	  (printf "Return: ~a~n" (send c get-value))]))))
+	  (printf "Return: ~a\n" (send c get-value))]))))
 
   (define f (make-frame frame% "Text Test"))
   (define p (make-object vertical-panel% f))
@@ -1701,7 +1701,7 @@
 		     (send f set-status-text s)))]
 		[on-scroll
 		 (lambda (e) 
-		   (when auto? (printf "Hey - on-scroll called for auto scrollbars~n"))
+		   (when auto? (printf "Hey - on-scroll called for auto scrollbars\n"))
 		   (unless incremental? (on-paint)))]
 		[init-auto-scrollbars (lambda x
 					(set! auto? #t)
@@ -1877,7 +1877,7 @@
 			       (let ([c (car (send p get-children))])
 				 (let-values ([(w h) (send c get-size)]
 					      [(cw ch) (send c get-client-size)])
-				   (printf "~a: (~a x ~a) client[~a x ~a] diff<~a x ~a> min{~a x ~a}~n"
+				   (printf "~a: (~a x ~a) client[~a x ~a] diff<~a x ~a> min{~a x ~a}\n"
 					   c w h cw ch
 					   (- w cw) (- h ch)
 					   (send c min-width) (send c min-height)))))
@@ -1962,7 +1962,7 @@
   (make-object button% "Rename" p2 (lambda (b e)
 				     (send p set-item-label (quotient (send p get-number) 2) "Do&nut")))
   (make-object button% "Labels" p2 (lambda (b e)
-				     (printf "~s~n"
+				     (printf "~s\n"
 					     (reverse
 					      (let loop ([i (send p get-number)])
 						(if (zero? i)
@@ -2000,10 +2000,10 @@
 (define (message-boxes parent)
   (define (check expected got)
     (unless (eq? expected got)
-      (fprintf (current-error-port) "bad result: - expected ~e, got ~e~n"
+      (fprintf (current-error-port) "bad result: - expected ~e, got ~e\n"
 	       expected got)))
   (define (big s)
-    (format "~a~n~a~n~a~n~a~n" s
+    (format "~a\n~a\n~a\n~a\n" s
 	    (make-string 500 #\x)
 	    (make-string 500 #\x)
 	    (make-string 500 #\x)))
diff --git a/collects/tests/gracket/windowing.rktl b/collects/tests/gracket/windowing.rktl
index 3c952a89..d6e2120e 100644
--- a/collects/tests/gracket/windowing.rktl
+++ b/collects/tests/gracket/windowing.rktl
@@ -39,7 +39,7 @@
   (test (list s) 'yield-wrapped (yield (wrap-evt s (lambda (v) (list v))))))
 
 (define (enable-tests f)
-  (printf "Enable ~a~n" f)
+  (printf "Enable ~a\n" f)
   (st #t f is-enabled?)
   (stv f enable #f)
   (st #f f is-enabled?)
@@ -47,7 +47,7 @@
   (st #t f is-enabled?))
 
 (define (drop-file-tests f)
-  (printf "Drop File ~a~n" f)
+  (printf "Drop File ~a\n" f)
   (st #f f accept-drop-files)
   (stv f accept-drop-files #t)
   (st #t f accept-drop-files)
@@ -55,7 +55,7 @@
   (st #f f accept-drop-files))
 
 (define (client->screen-tests f)
-  (printf "Client<->Screen ~a~n" f)
+  (printf "Client<->Screen ~a\n" f)
   (let-values ([(x y) (send f client->screen 0 0)])
     (stvals '(0 0) f screen->client x y))
   (let-values ([(x y) (send f screen->client 0 0)])
@@ -66,7 +66,7 @@
   (stv f refresh))
 
 (define (area-tests f sw? sh? no-stretch?)
-  (printf "Area ~a~n" f)
+  (printf "Area ~a\n" f)
   (let ([x (send f min-width)]
 	[y (send f min-height)])
     (st sw? f stretchable-width)
@@ -76,7 +76,7 @@
     (let-values ([(w h) (if no-stretch?
 			    (send f get-size)
 			    (values 0 0))])
-      (printf "Size ~a x ~a~n" w h)
+      (printf "Size ~a x ~a\n" w h)
       (when no-stretch?
 	(stv f min-width w) ; when we turn of stretchability, don't resize
 	(stv f min-height h))
@@ -95,7 +95,7 @@
 
 (define (containee-tests f sw? sh? m)
   (area-tests f sw? sh? #f)
-  (printf "Containee ~a~n" f)
+  (printf "Containee ~a\n" f)
   (st m f horiz-margin)
   (st m f vert-margin)
   (stv f horiz-margin 3)
@@ -108,14 +108,14 @@
   (stv f vert-margin m))
 
 (define (container-tests f win?)
-  (printf "Container ~a~n" f)
+  (printf "Container ~a\n" f)
   (let-values ([(x y) (send f get-alignment)])
     (stv f set-alignment 'right 'bottom)
     (stvals '(right bottom) f get-alignment)
     (stv f set-alignment x y)))
 
 (define (cursor-tests f)
-  (printf "Cursor ~a~n" f)
+  (printf "Cursor ~a\n" f)
   (let ([c (send f get-cursor)])
     (stv f set-cursor c)
     (st c f get-cursor)
@@ -131,7 +131,7 @@
 
 (define (show-tests f)
   (unless (is-a? f dialog%)
-    (printf "Show ~a~n" f)
+    (printf "Show ~a\n" f)
     (let ([on? (send f is-shown?)])
       (stv f show #f)
       (when on?
@@ -193,7 +193,7 @@
 	   (st #f f get-menu-bar))]
 	[space-tests
 	 (lambda ()
-	   (printf "Spacing~n")
+	   (printf "Spacing\n")
 	   (let ([b (send f border)])
 	     (stv f border 25)
 	     (st 25 f border)
@@ -209,14 +209,14 @@
 	   (drop-file-tests f))]
 	[client->screen-tests
 	 (lambda ()
-	   (printf "Client<->Screen~n")
+	   (printf "Client<->Screen\n")
 	   (let-values ([(x y) (send f client->screen 0 0)])
 	     (stvals '(0 0) f screen->client x y))
 	   (let-values ([(x y) (send f screen->client 0 0)])
 	     (stvals '(0 0) f client->screen x y)))]
 	[container-tests
 	 (lambda ()
-	   (printf "Container~n")
+	   (printf "Container\n")
 	   (area-tests f #t #t #t)
 	   (let-values ([(x y) (send f container-size null)])
 	     (st x f min-width)
@@ -238,15 +238,15 @@
     (container-tests)
     (cursor-tests)
 
-    (printf "Init~n")
+    (printf "Init\n")
     (init-tests #f)
     (stv f show #t)
     (pause)
-    (printf "Show Init~n")
+    (printf "Show Init\n")
     (init-tests #t)
     (stv f show #f)
     (pause)
-    (printf "Hide Init~n")
+    (printf "Hide Init\n")
     (init-tests #f)
     (send f show #t)
     (pause)
@@ -258,7 +258,7 @@
 
     (stv f change-children values)
     
-    (printf "Iconize~n")
+    (printf "Iconize\n")
     (stv f iconize #t)
     (pause)
     (pause)
@@ -272,7 +272,7 @@
     (stv f maximize #f)
     (pause)
 
-    (printf "Move~n")
+    (printf "Move\n")
     (stv f move 34 37)
     (pause)
     (FAILS (st 34 f get-x))
@@ -280,7 +280,7 @@
     (st 150 f get-width)
     (st 151 f get-height)
 
-    (printf "Resize~n")
+    (printf "Resize\n")
     (stv f resize 56 57)
     (pause)
     (FAILS (st 34 f get-x))
@@ -306,7 +306,7 @@
 
     (cursor-tests)
 
-    (printf "Menu Bar~n")
+    (printf "Menu Bar\n")
     (let ([mb (make-object menu-bar% f)])
       (st mb f get-menu-bar)
       (st f mb get-frame)
@@ -320,11 +320,11 @@
       
       (st null mb get-items)
 
-      (printf "Menu 1~n")
+      (printf "Menu 1\n")
       (let* ([m (make-object menu% "&File" mb)]
 	     [i m]
 	     [delete-enable-test (lambda (i parent empty)
-				   (printf "Item~n")
+				   (printf "Item\n")
 				   (st #f i is-deleted?)
 				   (st #t i is-enabled?)
 				   
@@ -371,7 +371,7 @@
 
 	(st null m get-items)
 
-	(printf "Menu Items~n")
+	(printf "Menu Items\n")
 	(let ([i1 (make-object menu-item% "&Plain" m 
 			       (lambda (i e)
 				 (test-control-event e '(menu))
@@ -391,7 +391,7 @@
 	       (lambda (i empty name)
 		 (delete-enable-test i m empty)
 		 
-		 (printf "Shortcut~n")
+		 (printf "Shortcut\n")
 		 (set! hit i)
 		 (stv i command (make-object control-event% 'menu))
 		 (test name 'hit-command hit)
@@ -437,7 +437,7 @@
 
 	  'done)
 
-	(printf "Menu 2~n")
+	(printf "Menu 2\n")
 	(let* ([m2 (make-object menu% "&Edit" mb "Help Edit")]
 	       [i2 m2])
 	  (st (list i i2) mb get-items)
@@ -468,7 +468,7 @@
 (define (test-controls parent frame)
   (define side-effect #f)
   
-  (printf "Buttons~n")
+  (printf "Buttons\n")
   (letrec ([b (make-object button% 
 			   "&Button"
 			   parent
@@ -484,7 +484,7 @@
     
     (containee-window-tests b #f #f parent frame 2))
 
-  (printf "Check Box~n")
+  (printf "Check Box\n")
   (letrec ([c (make-object check-box% 
 			   "&Check Box"
 			   parent
@@ -511,7 +511,7 @@
 			#t)])
     (st #t c get-value))
 
-  (printf "Radio Box~n")
+  (printf "Radio Box\n")
   (letrec ([r (make-object radio-box%
 			   "&Radio Box"
 			   (list "O&ne" "T&wo" "T&hree")
@@ -586,7 +586,7 @@
 			 '(vertical)
 			 3))
 
-  (printf "Gauge~n")
+  (printf "Gauge\n")
   (letrec ([g (make-object gauge% 
 			   "&Gauge"
 			   10
@@ -618,7 +618,7 @@
     
     (containee-window-tests g #t #f parent frame 2))
 
-  (printf "Slider~n")
+  (printf "Slider\n")
   (letrec ([s (make-object slider% 
 			   "&Slider"
 			   -2 8
@@ -774,7 +774,7 @@
 
 	   'done-list)])
 
-    (printf "Choice~n")
+    (printf "Choice\n")
     (letrec ([c (make-object choice%
 			     "&Choice"
 			     '("A" "B" "C & D")
@@ -808,7 +808,7 @@
 
     (let ([mk-list
 	   (lambda (style)
-	     (printf "List Box: ~a~n" style)
+	     (printf "List Box: ~a\n" style)
 	     (letrec ([l (make-object list-box%
 				      "&List Box"
 				      '("A" "B" "C & D")
@@ -869,7 +869,7 @@
 
   (let ([c (make-object canvas% parent '(hscroll vscroll))])
 
-    (printf "Tab Focus~n")
+    (printf "Tab Focus\n")
     (st #f c accept-tab-focus)
     (stv c accept-tab-focus #t)
     (st #t c accept-tab-focus)
@@ -880,7 +880,7 @@
     ; (stv c set-scrollbars 100 101 5 6 2 3 10 20 #t)
     (let-values ([(w h) (send c get-virtual-size)]
 		 [(cw ch) (send c get-client-size)])
-      (printf "Canvas size: Virtual: ~a x ~a  Client: ~a x ~a~n" w h cw ch)
+      (printf "Canvas size: Virtual: ~a x ~a  Client: ~a x ~a\n" w h cw ch)
       (let ([check-scroll
 	     (lambda (xpos ypos)
 	       (let-values ([(x y) (send c get-view-start)])
@@ -958,7 +958,7 @@
 			 102)])
     (let loop ([n 100])
       (unless (zero? n)
-	(send e insert (format "line ~a~n" n))
+	(send e insert (format "line ~a\n" n))
 	(loop (sub1 n))))
 
     (st #f c allow-scroll-to-last)