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If you can figure out what triggered that, it's something we'd definitely want to know about; in a couple of cases, the style system can do the wrong thing and cause this behavior. We've tracked down a couple of cases where it happens, but it sounds like there's at least one more.

In the meantime, the fix for the problem is to open up the "Style" pane of OmniFocus' preferences, then press the "Reset" button in the lower left.

Does that help?