Ah! My automatic brightness was on. I've turned it off and rebooted. I'll be back with my findings.

@Caponsacchi The company has not bought f.lux. And Apple devices are LED backlit, which do not emit UVB.

I recommend working with Sparkle to see if they can allow you to control this in a future release of their library. At the very least, mention in the text what app is using sparkle.

Yes thanks Iorna. I had to do both things: disable auto-brightness & reboot. One or the other by itself did not do the trick.

Bedtime lighting is set based on your wake time. The reason for this is because the amount of sleep may vary a lot between people, but your nightly melatonin cycle needs about 9-10 hours after darkness falls. So you can set your wake time to a different number or you can try some of the other settings under preferences. Lots of info here: http://justgetflux.com/news/pages/macquickstart/

@rlandis open activity monitor and close f.lux there. Then reopen it.

having the same problem!!! Where to make a issue?

What operating system? You're posting under Mac, so have you deleted the f.lux profile from System Preferences > Displays? Have you rebooted?

Try these two things first. Then, if you still have trouble, post back with your system details, your f.lux version, and anything else we should know about your hardware and what's happening. We're here and we're very happy to help you remove it or find settings that you prefer.

A couple questions: Which version of the Mac OS and which version of f.lux? If you open the f.lux settings to the left of your system clock, under "preferences" do you have "recommended" or "custom" settings?

Update on this:

I followed the instructions below (i.e. disabling "Automatically Adjust Brightness") and it fixed the issue on one of my workstations but not on the other.

Edit: I did a reboot on the other workstation and it's working correctly :-)

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These instructions are from the flux quick start guide.

@CrustyBaker Yikes... uh, it sounds like there are some very serious configuration issues here, and I'm not saying it's on you. Maybe something got corrupted and I do agree that an uninstall is warranted here for sure. So, I believe I've already posted all the relevant uninstallation information, so if you have any difficulties finding something, or if a process doesn't work (like maybe it's not showing up in the activity monitor, or the tint is still active) just ask for help.

EDIT: I think the f.lux guide for mac would be very helpful. I know this version has added quite a few settings even I'm not remotely familiar with and would surely read this if I were using the version. (I'm a windows user).

Here mac help link: https://justgetflux.com/news/pages/macquickstart/