I think it's Microsoft Night Light, so find it and disable it.

@fluxer1 Thank you so much!

@herf Thank you very much. I'm very happy, that I can continue to use this great app!

Well.. The way I see it, it's exactly the opposite. If you are in full screen at night (f.lux is disabled) and then switch to desktop - it's much worse, to stare the horrid blue light until it gradually goes back to night setting again.
Anyway, I guess I'll have to get used to the Disable F.lux shortcut now for my full-screen needs, unless they introduce back the instant option...

You're welcome.

All of these keyboard shortcuts are new with Version 4. Some of them didn't even exist until very recently.

This is good

... and PS, I already know how to Customize the Tray icons. I'm hoping for a way to prevent the icon from disappearing on its own. Danke schoen.

Interesting - this is the "certificate revocation list" from Comodo. This is the "browser" (here the internet explorer code we use to check for updates) making sure our SSL certficate has not been revoked.

Usually this bandwidth cost would be "shared" among multiple apps/websites, but in this case, f.lux made the first SSL request with this registrar, so IE pulled the CRL down also.

https://blog.cloudflare.com/the-hard-costs-of-heartbleed/

v3.17 should not be updating (that is the setup3 link).

However, if you had another version that had downloaded an installer, 3.17 would run it on relaunch.

Can you try these steps?

Uninstall f.lux Install setup3

@tungsten_smooth Thank you very much for your help :)

This is usually Intel's DSPT ("Display power saving technology") and it's a video driver update, not f.lux that's doing it.

DSPT is getting harder to disable, but look for the Intel HD Graphics Control Panel, and some reddit posts have registry hacks to turn it off too.

Glad you spotted the potential culprit ! Thanks for your careful work ;)

I was going to say that I agree with christian but instead I do think twocables is absolutely correct. 1900K is more than enough if you really think about it.