Same thing with 4.69. Makes app completely useless, windows night light works but is pain in the ass also. Switchin on and off when coming out of game.
I'd quite like it too. I already have key bindings on my mouse's extra keys for adjusting color temp up and down -- while at the same time adjusting my monitor's brightness with DDC/CI, my Philips Hue's color temp and its brightness too. It's annoying that sometimes it feels like I have to fight f.lux. Maybe I'll have to write my own version that is more amenable to user-configuration.
I changed the Wake Up time from 7:30 AM to 5:00 AM and have not had this problem since . Why this would fix my issue, I have no idea, thought I should mention that though