Ditto. Quick Mask is always the culprit for me. My History panel wouldn't appear correctly either (the outline of the history panel would just glow and then disappear and "Quick Mask" in the title bar was appearing in real-time I think. Even after I got out of Quick Mask, I almost saved a simple JPG with a Quick Mask indicator on Save until I deleted it from Channels. Quick Mask = Quick Bugs sometimes.
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