diff --git a/collects/macro-debugger/syntax-browser/color.ss b/collects/macro-debugger/syntax-browser/color.ss
index 8430481377..70ba1ee006 100644
--- a/collects/macro-debugger/syntax-browser/color.ss
+++ b/collects/macro-debugger/syntax-browser/color.ss
@@ -8,8 +8,9 @@
   (provide syntax-text-colorer%)
   
   (define colors 
-    (list "black" "darkred" "red"
-          "green" "mediumforestgreen" "darkgreen" 
+    (list "black" "red" "blue"
+          "mediumforestgreen" "darkgreen" 
+          "darkred"
           "cornflowerblue" "royalblue" "steelblue" "darkslategray" "darkblue"
           "indigo" "purple" 
           "orange" "salmon" "darkgoldenrod" "olive"))
diff --git a/collects/macro-debugger/syntax-browser/pretty-helper.ss b/collects/macro-debugger/syntax-browser/pretty-helper.ss
index 4f62b9b0a4..e9cc88da3e 100644
--- a/collects/macro-debugger/syntax-browser/pretty-helper.ss
+++ b/collects/macro-debugger/syntax-browser/pretty-helper.ss
@@ -84,6 +84,8 @@
                        (pairloop (cdr obj)))]
                 [(null? obj)
                  null]
+                [(and (syntax? obj) (null? (syntax-e obj)))
+                 null]
                 [else (loop obj)]))
         (values (loop stx)
                 flat=>stx
diff --git a/collects/macro-debugger/view/gui.ss b/collects/macro-debugger/view/gui.ss
index c74beef175..48c4221d44 100644
--- a/collects/macro-debugger/view/gui.ss
+++ b/collects/macro-debugger/view/gui.ss
@@ -61,7 +61,10 @@
         (class base-frame%
           (init policy
                 macro-hiding?)
-          (init (show-hiding-panel? #t))
+          (init (show-hiding-panel? #t)
+                (identifier=? #f)
+                (width (sb:pref:width))
+                (height (sb:pref:height)))
           (inherit get-menu%
                    get-menu-item%
                    get-menu-bar
@@ -70,9 +73,9 @@
                    get-help-menu)
           
           (super-new (label "Macro stepper")
-                     (width (sb:pref:width))
-                     (height (sb:pref:height)))
-          
+                     (width width)
+                     (height height))
+
           (define/override (on-size w h)
             (send widget update/preserve-view))
           
@@ -137,8 +140,16 @@
                  (policy policy)
                  (macro-hiding? macro-hiding?)
                  (show-hiding-panel? show-hiding-panel?)))
-
           (define/public (get-widget) widget)
+
+          (begin
+            (when identifier=?
+              (let ([p (assoc identifier=? (sb:identifier=-choices))])
+                (when p
+                  (send (send widget get-controller)
+                        on-update-identifier=?
+                        (cdr p))))))
+          
           (frame:reorder-menus this)
           ))
 
@@ -311,7 +322,7 @@
                 (unless step
                   (let ([result (lift/deriv-e2 synth-deriv)])
                     (when result
-                      (send sbview add-text "Normal form\n")
+                      (send sbview add-text "Expansion finished\n")
                       (send sbview add-syntax (lift/deriv-e2 synth-deriv)))
                     (unless result
                       (send sbview add-text "Error\n"))))