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I'm new to Omniplan and having a lot of difficulty.
After working a while "undo" throws :
undo: NSUndoManager 0x15e2d100 is in invalid state, undo was called with too many nested undo groups

restart didn't help. My plan is not very complex.

MBP, 10.5.4, Ommiplan 1.6 rc1

Brian