alright this may help some ppl out as i had to figure it out myself,
with photoshop cs6 there is a graphics processing system which uses your gpu,
however mine worked for a day then stopped...
a file called sniffer_gpu.exe under your adobe program files...
this basically sniffs out any issues with ur gpu drivers or card, however it seems to find problems which are total "BS"

FIX...

simply change the name of the file to sniffer_gpu2.exe (search your adobe files)_(and any problems just change it back to original name)
i have it working 100% now, no greyed out filters since i made the change how this helps someone else as the net is full of questions on how to fix this issue.