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I upgraded to Mountain Lion yesterday and I can't start Omnigraffle since.
The application opens and tries to re-open the document I was previously working on. Then the mouse turns into the multicolour wheel and Omnigraffle stop responding.

I was running 5.4 at first and also tried to upgrade to the last rc (5.4.1).

Does anybody have a clue?
Is there a way to launch a blank Omnigraffle (without any previous document being loaded ?)