In OS X 10.5.3 using 0140, if you have a lot of sketches in your list
(enough to fill the screen), the scroll arrow on the sketches list is not
visible in two cases:

1) If you've altered Info.plist and set useScreenMenuBar to false, the File
menu list goes off the screen with no arrow
2) Clicking the open icon shows a list that does the same

These are currently the only workarounds to bug
http://dev.processing.org/bugs/show_bug.cgi?id=786, so the only way to
access some of your sketches without running into that bug is to use
File->Open and browse directly through the FS to the sketch.

http://processing.org/reference/troubleshooting/index.html#cantfix

*** This bug has been marked as a duplicate of 391 ***