I am using a Radeon HD7700 graphics card with 3 screens. Under Windows 8 all worked well.
After upgrading to Windows 8.1 only 2 screens work. What I find strange is that at boot up screens 1 and 3 display the boot info right up to the windows 4 panel flag. However when Windiws logon screen appraes screens 1 and 2 are working and screen 3 is blank. Screens 1 & 2 are the VGA ports.
In Catalyst Control Center only 2 screens are showing, one under VGA and one under Flat Panels.
I have upgraded to the latest beta drivers from the AMD site and still only 2 screens work.
Any suggestions would be appreciated.