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How long are you waiting? Just because the status goes to Not Responding doesn't mean that it would recover. It could be that OF is trying to compress your database on exit and isn't getting enough time to finish. (I've seen similar problems with other apps, and with OF a few versions ago. Typically, once the app is given enough time to finish its clean up, it runs fine after that.)

I'd suggest contacting the Support Ninjas (Help → Send Feedback). They can walk you through the steps to "sample" the application, which will give the developers enough information to fix the problem in future releases.