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Update:

I found out that the problem I have is probably not one of OF; it's concerning my user account. (So far I still have reason to hope that it's not systemwide.)

The symptoms appeared in OF first. For many days it was the only application that caused trouble, so I figured that the problem must be with OF, since all other applications I used in that time worked normally. Yesterday I started OmniOutliner and had the very same problems; later I hat them also with iWork (Pages and Numbers).

So now I have created a new user account and moved OF there. No irregularities I've noticed so far. If it keeps working, I'm going to move all my other stuff to the new account and then delete the old one. Thanks for that tip and also thanks for your answers.