macOS Sierra Multi-monitor
I'm using a mac with an attached external screen.
the main screen (native) is ok with f.lux (yes missing dark mode ...) but the second screen have issue to keep the proper profile of color ... it's don't stay calibrated during the day (except if I turn off f.lux manually )
the night it's a little bit better ....
is it a new issue? I don't remember to had the same one with El cap...