Error on Opening Stacks and No Longer Recent

[JamesHBeckmann at aol.com]

The following appears whenever I now open a stack:

>> • There was an Execution Error at 7:01:59 PM
Error description:  if-then: error in statement
Revolution User Interface Error: Object: button id 1137 of group id 1136 of 
card id 1002 of stack "/Macintosh HD/Desktop Folder/Revolution 1.1 
Classic/components/tools/revmenubar.rev"
--------------------
if it is not empty then
--------------------
Value: menuPick<<

How do I correct this?

Also my most recently visited stacks no longer appear under the menu "Open 
recent stacks".

Any ideas appreciated.

Jim