"Disable for current app" enables it when f.lux is disabled everywhere else
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I had f.lux disabled for iTunes, because we sometimes watch something late at night. We went to watch something earlier and the colour was wonky - and sure enough, all the buttons had turned orange as if it was in bedtime mode, while the rest of the computer was being happily white. I confirmed it was a f.lux change by quitting f.lux - everything went back to normal colour.