It happened to me too!
Only after I updated to OG 5.4, I am on OS 10.7.4...
I had started another thread by mistake, but I think the error is the same:
http://forums.omnigroup.com/showthre...emovingIfEmpty
I got this bug after grouping components in the canvas, and trying to use either magic mouse or trackpad to scroll on the document.
I got these messages from the console...
Code:
6/15/12 1:01:31.224 PM OmniGraffle Professional: _endUndoGroupRemovingIfEmpty:: NSUndoManager 0x10af86710 is in invalid state, endUndoGrouping called with no matching begin
6/15/12 1:01:31.527 PM OmniGraffle Professional: _endUndoGroupRemovingIfEmpty:: NSUndoManager 0x10af86710 is in invalid state, endUndoGrouping called with no matching begin
6/15/12 1:01:34.167 PM OmniGraffle Professional: _endUndoGroupRemovingIfEmpty:: NSUndoManager 0x10af86710 is in invalid state, endUndoGrouping called with no matching begin
Finally, as it has been mentioned by others, this bug is making my productivity plunge as I have to restart the app every time it shows...
Thanks!
Leenyx