OK, I can understand why a two week delay works best for you, but now it's been over four weeks. I have 41.4 but heard that 41.5 is out now and it still tells me I 40.1 is latest. Are you still fighting with bugs in 41.x?
I had this issue too, unfortunately you cannot set your own sunset, or even better would be just pick times when you want the brightness to change! Only 3 changes would be fine like we have currently, but more would be great.
Anyways, I found a workaround that works for me. I have sensitive eyes so I like it to start getting dimmer as it is getting dark but not yet "sunset" and then even dimmer later.
I achieved this by setting the Bedtime color to be the highest at 5000K, then the Sunset to be "Incandescent" and the Daytime to be 3300K. Then I set my earliest wakeup time to 7:00 PM. By doing this I was able to adjust the graphs to something that works for me. You can set a slider to be higher than the slider above it by holding Control while you move it.
Just play around with it and I am sure you can find a setting that works for you!
I suspect f.lux has detected that your machine has two GPUs and is trying to handle the switch between them using a modified color profile. I haven't seen this bug before, but macOS seems to be double-loading the profile sometimes.
made an account just to add to this thread so the people who make flux might someday do this: just make it off by default. i love flux and i'm still glad i got it, but this "backwards alarm clock" thing is genuinely confusing, i scanned the options menu 3 separate times, thinking i must be missing something, before googling it and finding this thread, and realizing i did miss it because i had no idea what the phrase "backwards alarm clock" meant. you can and should rename it something less confusing too, but even if you keep calling it that, just have it off by default because no one wants it. no one installs flux to have a backwards alarm clock, they just want their screen dimmed, so that's all flux should do BY DEFAULT.
again, i still like flux and will still recommend it to people but i hate that now i have to say "hey go get this cool app btw when you get it you have to open the options menu and disable these popup notifications to make the app usable so it doesn't pop up every 30 minutes while you're playing a game or worse, doing work"
edit: and the fact that this is a 5 year old thread and this is still a thing is actually kinda impressive. i dunno how you go that long without doing any kind of focus testing because you'd immediately find out that probably 90% of people turn it off. or maybe they don't, because they actually can't find the spot to do it?
You may consider a menu bar manager, I'm using Bartender.
On MacMenuBar.com there are a lot of menu bar managers.
With this tools you can hide menu bar items.
Usually these items are still accessible with a single click or keyboard shortcut.
Not so brilliant if it doesn't include a basic feature that has been requested for years and years. I'm pretty sure the developer just wants us to bugger off, and no, you won't be seeing manual buttons anytime soon. Probably never.
There's other choices out there now, mostly because people have encountered so many limitations with f.lux and decided to write their own.