flickering in firefox

I just noticed something.



in windows 8.1 when sli is enabled. firefox window and thunderbird window flickers when moving mouse across them.



I also use stardock windowsfx and windows animations was flickering.



disabled sli and flickering gone.



so...



drivers?



using pcb sli bridge that came with this new asrock motherboard, before was using the ribbon sli bridge that came with my bad gigabyte board. maybe sli bridge problem? or motherboard problem?



checked all connections and they are ok.





edit:



just remember my windows 7 install doesnt have this problem...



now have to figure out why my windows 8.1 install having the glitches.





edit:



:bang:



clean driver install fixed the problem it seems....should of did this before posting.....but me no think good with lack of sleep...

flickering in firefox