I just upgraded to 14.2 beta today, and sadly I will have to downgrade because of the bug with supporting 120 hz monitors. It was running fine on 13.x with the exact set up listed below.
My current set up:
(3) GD235HZ ( 120hz monitors )
(2) Sapphire 7970 GHz (6GB edition) sli ( I only play a few games in eyefinity mode, so having 120hz on my main monitor is very important to me )( running in extended mode )
windows 7 (64 bit )
I am running 3x1 landscape, with the side monitors running at 60 Hz and my middle monitor running at 120hz off Dual DVI, the sides are running off displayport with a mini displayport to dvi adaptor. It "worked" kind of in the sense that it showed something on screen, but as soon as I restarted the pc it said that the monitor was unsupported. And I had to change my monitor settings via teamviewer just to be able to use my pc again. ( safemode would have probably worked but ya, its a pain )
I also tried setting it to 120hz via the amd catalyst control center and then the screen became blurry, but did not display any other visual graphical issues such as lines or blue pixelation.
If any additional information is required please let me know