If you have a dual GPU mac, f.lux v34 will install a “f.lux profile” while it’s running, in order to avoid flashing as OS X switches between video cards. You can see this in System Preferences > Displays > Color. This new profile preserves everything in the system profile except the display table, and it reverts to the normal one when f.lux exits, and during the day.
If you have a dual-GPU Mac and this behavior causes problems (i.e. you don’t want us to touch your profile), you can turn it off like this:
defaults write org.herf.Flux disableProfile 1
And then make sure to delete the “f.lux profile” from your Color settings.
To turn it back on again:
defaults delete org.herf.Flux disableProfile
If you are experiencing flashing due to an app other than f.lux, it may in some cases help to enable this new behavior on single-GPU machines too. We’re wondering if flashing while running Parallels may be such a case, but we have not tested this as a fix yet.
To do that:
defaults write org.herf.Flux writeProfile 1
And then to turn things back to the default settings, you should delete the f.lux profile from your Color settings, and do this too:
defaults delete org.herf.Flux writeProfile