Had the same problem, tried everything I could from 1903 threads: install and uninstall countless times, update drivers, downgrade drivers, upgrade again, regedit cleaning, Fast Startup disabling, etc.

Eventually I tried uninstalling the Store app and then installing via executable --> immediately worked! Hope this solves your issue.
Latest download is found here: https://justgetflux.com/dlwin.html

@GreyName Me too. It's mind boggling how they just ignore it, or give the very lame excuse "We know better than you what's good for you". They obviously haven't been to parts of the world where it's sunny all night through in the summer and no sun at all whatsoever in the winter. Where tuning the light inside and on computer screens is the only option to normalize daytime hours and fight against winter depression and summer insomnia.

@Raekai said in Option for one color all day:

I do have to remember to change them because I change them fairly frequently. If I'm watching a movie or something, I like to use a cooler temperature. But the Sunset color can change that when the time comes. Et cetera.

The Classic f.lux bit is helpful, though, as I only have to deal with two times. Thanks. It'd be nice just to be able to set as many or as few times as we want.

There's Movie Mode. Just use that when you watch a movie.

This bug seems to fixed already. It's not reproducable for me at v4.111

@Architekt I support this idea. And it seems like a relatively simple feature to add, is it not? PLEASE let us use the smart bulb feature with only color temperature changes, and no control over brightness. I think the smart bulb feature would be amazing with that ability. And I think there are many more of us who would enjoy this feature, too:

https://www.reddit.com/r/Hue/comments/90qtid/auto_change_color_temp_based_on_time_of_day/e2u33hg/

@herf Thank you so much! So let's hope ;-) BTW, I like f.lux very much. It's useful and handy even today, as it is.

To add to your notes, I upgraded to a new PC, also with an AMD 5700 XT and have the exact same issue.
I had to downgrade my Amd Radeon Adrenalin 2020 to 19.9.2 because the newer driver caused several issues I'm unable to deal with atm but at the exact time this visual error came up.
So for me it's either this bug, or buggy GPU drivers... If anyone has this issue I suggest updating your graphics drivers.
iiyama Red Eagle, 1440p 144hz via Displayport & MSI Evoke 5700 XT OC. Win 10 pro.

Have the same problem with a 1070 Ti, after an update brightness control works, and after an other it doesn't...
Annoying