In System Prefs > Displays do you have a f.lux profile? Delete it, then if you continue to have problems restart.

Any news about this issu?

Please help

Something like that or the ability to control brightness with Flux would be handy.

I use a Macbook Pro with an external monitor.

El Capitan does not allow any adjustment of external monitor's brightness.

I used a 3rd party app called Brightness Control, it's able to adjust brightness across both screens by creating a translucent mask and varying its opacity.

HOWEVER, Brightness Control and Flux do not work together. So I can either dim my display and lose the color temperature control, or vice versa.

Since Flux controls color temperature, it would be handy for Flux to control brightness too.

Thank you Harald, we really appreciate your kind words and your support!

f.lux 37.7 & macOS 10.12 (16A323).
Biggest issue is that it does not recognize, 10.12 has a dark mode. For me, the biggest bother.
I have seen an instance, where it could not get the correct time or location and would not darken.

I still use it.

Can you post any more information about "crashes"?

@onotole f.lux actually modifies this setting for activation at sunset. Then I assume it sets the "dark theme" back to unchecked, once sunrise happens. It's probably enabled by default in f.lux, so look in the settings there first.

@lorna i didn't know i could. it took some poking around as it wasn't in preferences but yes, it was disabled. thanks

Yes. That is what I found. Once I closed the tab with that video the screen saver and f.lux works as they should.

I fixed the problem on my machine. I opened up the flux preferences .plist file and removed the name of the profile listed, then restarted flux. It now correctly loads the profile I have selected.

Interestingly, the profile flux kept loading was one with a long UUID tag (if that is the correct term for it) in the name.