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Originally Posted by Woody View Post
Why does the undo feature not work? When I try I just get:

undo: NSUndoManager 0x159b64e0 is in invalid state, undo was called with too many nested undo groups
It's a bug, see this thread: http://forums.omnigroup.com/showthread.php?t=9489

Are you running the latest version? There have been some changes to fix at least some instances of this bug in recent versions. If it still happens with the latest versions, I'm sure Omni would love a sanitized copy of your document along with instructions on how to make it fail (use Help->Send Feedback to send a sanitized copy of the document).