your problem is not to do with f.lux , its becaise bad display port cable, try buying a new one.
I had same problem and solved buying a good dp cable.

cheers

Can you post the version of macOS and the version of f.lux?

I have a similar issue. I'm running High Sierra on a MacBook Pro with an external monitor connected via thunderbolt. Whenever the screen goes into sleep mode, it's really crashed. the screens are black, but not completely off. I have to do a hard restart. Took a lot of trial and error, but it stopped happening once I disabled Flux.

@Naomi-Schoenfeld oh yes!

There is an Option to use "expanded daytime settings" and that will unlock the slider for daytime and sunset.

People usually try out the lowest and highest value in a slider, so we limited them, but if you turn off bedtime mode, you'll probably want to set this option.

@herf Changing color profiles and rebooting fix this problem. thank you!

I spoke too soon. Still crashing :(

When you move the slider all the way to the right, it turns off this part of the schedule. We did this for people who really like sunrise to sunset only.

All you have to do to fix it is to choose any other slider point in bedtime mode (or pick a preset other than "Classic f.lux")

This is a macOS feature, and we just turn it on.
Newer apps will switch.

No, I also can't see that.

@herf said in Removing app from Disable for...:

@THX1138b this is our macOS forum, so it is different. For Windows, I recommend you get the latest f.lux v4 which has a complete list of disabled apps in the menu: https://justgetflux.com/flux-setup4.exe

Thanks but I have version 4.47 and I have explored every menu and there is no list of disabled apps.

0_1507439252133_upload-dfe93fd4-ad68-4e8e-a84b-d83f21829cf9

There is "dim on disable" which may help...

@herf I'm running Windows 7. The program interface did change about a month or so ago. At first I would try to open f.lux and it would be behind all of the windows. Then it (in its original form) didn't appear at all..Then I noticed there was an f.lux icon in the bottom right hand of the task bar beside the clock. But that now opens a really large interface with useless information. Why couldn't it just stay the way it was? And yes, I will adjust that annoying thing that assumes I'm a complete moron who doesn't know what time to get up.

Thank you for the response but it would be far better if you just rolled it back to the previous version that had nothing wrong with it at all.

We have a small minority of our users (<<1%) who try to avoid all blue light due to headaches or other reasons.

We don't think this is a good idea for most people (as explained in my 2015 post), so this is a rather hidden feature for those people to get more extreme settings during the day. By default, we limit the range.

But right now we don't know of a way to make a white screen any brighter.

@herf :thumbsup_tone3: