diff --git a/collects/scribble/run.ss b/collects/scribble/run.ss
index b491d36c..b64cdff0 100644
--- a/collects/scribble/run.ss
+++ b/collects/scribble/run.ss
@@ -92,6 +92,6 @@
               (when (current-info-output-file)
                 (let ([s (send renderer serialize-info r-info)])
                   (with-output-to-file (current-info-output-file)
-                    #:exists 'truncate/replace
                     (lambda ()
-                      (write s))))))))))))
+                      (write s))
+                    'truncate/replace))))))))))
diff --git a/collects/scribble/struct.ss b/collects/scribble/struct.ss
index 0f2b935b..84ab4e58 100644
--- a/collects/scribble/struct.ss
+++ b/collects/scribble/struct.ss
@@ -191,7 +191,7 @@
          (with-handlers ([exn:fail:contract?
                           (lambda (exn)
                             (error 'serialize-delayed-element
-                                   "serialization failed (wrong resolve info?); ~a"
+                                   "serialization failed (wrong resolve info? delayed element never rendered?); ~a"
                                    (exn-message exn)))])
            (vector
             (make-element #f (delayed-element-content d ri))))))
@@ -234,7 +234,7 @@
          (with-handlers ([exn:fail:contract?
                           (lambda (exn)
                             (error 'serialize-part-relative-element
-                                   "serialization failed (wrong resolve info?); ~a"
+                                   "serialization failed (wrong resolve info? part-relative element never rendered?); ~a"
                                    (exn-message exn)))])
            (vector
             (make-element #f (part-relative-element-content d ri))))))