Dual monitors, F.Lux affects one but not the other.
I had the same problem but the problem seems to be solved at this moment.
As @MrSwadge mentioned above, I also re-installed f.lux over an existing software and then the filter is now applied on both monitors.
@ReCrunch this came out yesterday which might be helpful for those using Display Link USB adapters http://www.displaylink.org/forum/showthread.php?p=82958#post82958
Just FYI for anyone coming here with Windows 7 and Intel HD Graphics 4600, I updated my display drivers and that did the trick immediately.
I knwo it's been a long time since the question came out.
But I had the same problem and I find a solution.
After you instal F.lux, you see that it works only on one screen.
Then, you change your theme in the seeting of the apparence of the screen. You'll see that F.lux automatically apply on both screen !
(sorry for the mistakes, I'm from Belgium :) )
I did a performance test in Settings and it works
If anyone finds this old thread, LastStar007's post fixed it for me. Quit f.lux and Run as Administrator did the trick.
Hi, wanna ask. Is it possible to connect 2 monitors through wireless hdmi, will it work?
this sometimes fixes the problem for me
click the lower timeline on the flux interface to get the "24 hour preview"
turn off your second monitor and turn it on again to see if flux has gone to it
if that does not work, close down flux and restart it with the second monitor on
if that fails, do it again with the second monitor off and then turn it on
This post is deleted!
Old Thread but in case you are still looking, this simple trick solved it for me!
From the display settings you can toggle which screen to make your main display.
Alternating between the available screens seems to have fixed the issue for me.
e.g. you have 2 screens (A and B), set monitor A as main display -> set monitor B as main display = profit!