diff -r 9dcfcdbdb2ba -r 21c42b095c84 lib/Tools/display
--- a/lib/Tools/display	Thu May 17 16:04:39 2012 +0200
+++ b/lib/Tools/display	Sun May 20 11:34:33 2012 +0200
@@ -74,6 +74,7 @@
   PRIVATE_FILE="${ISABELLE_TMP:-/tmp}/$$"$(basename "$FILE")
   mv "$FILE" "$PRIVATE_FILE" || fail "Cannot move file: $FILE"
   $VIEWER "$PRIVATE_FILE"
+  sleep 5   #try to avoid races
   rm -f "$PRIVATE_FILE"
 else
   exec $VIEWER "$FILE"