hello,
i was able to replicate this on three one-of-a-kind machines.

if you have iGPU (onboard Intel Video) enabled in the bios and drivers mounted, and you have an add-on video card (nvidia) established and number one, this blend will motive massive flickering.

In home windows, you need to force connect a non-existing "display" to the intel onboard video. This lets in for Intel short Sync era to paintings.

Why could you need the above setup? due to the fact, the above setup lets in you to take gain of Intel quick Sync to render/encode hardware improved video.
regards
mohit

Thanks for the report - is f.lux not working at all on 10.7? Or the UI is not appearing?

We are definitely trying to build for 10.7, but the oldest test machine we have is 10.8. (Also our updater, Sparkle, says it supports 10.7 too.)

We can downgrade you also, but I would love to fix what's going on.

What version are you running? There is a way to do this on all the current versions. If you are on Mac, make sure you have "Expand Daytime Settings" option checked, then set your daytime color. You will need to change the other colors.

We do not recommend sunset mode for use before bed as it still lets a lot of light through. If that's the mode most comfortable to you and you are concerned about light that can affect sleep, dimming your screen as far as you can will help a lot. See https://fluxometer.com/rainbow for some interactive charts.

@natemorales Thanks for the detailed notes, hope this gets worked out soon.

I found an INEXPENSIVE solution: use a min-DisplayPort -> DisplayPort cable. BOTH external displays are controlled by F.lux.

More details:
I discarded the USB to a DisplayLink to VGA cable, and replaced it with a mini DisplayPort to DisplayPort cable. You can find cheaper cables elsewhere. The Thunderbolt port on a Mac is a Mini DisplayPort.

Arthur

If you use Recommended Settings, f.lux will not change your default system color temperature until local sunset.

I wanted to precise that it's using High Sierra, with a GeForce GT 640.

@lorna

Thanks for the information. It's great to be able to pin down the culprit at last, and to know the issue is not on your side. I'm sorry for implying it most likely was.

Do you know if 10.10.5 would indeed fix this Flux issue ? :astonished:

I get this as well - for me, it's the Flux icon itself and the Microsoft OneDrive icon. Both Flux and OneDrive have gone through updates themselves and the OS has gone from 10.13.2 to .3 to .4 while this issue has been apparent. I've also performed a Time Machine restore in that time and had to setup Flux again from scratch,

Presently, macOS 10.3.4 with Flux 39.984.

Like you, my morning workaroud is to go into Preferences > General, uncheck the Dark Theme and then uncheck again.