Menus flickering / not working on 2nd monitor

I'm using FireFox 7 and it's worked great until just a few days ago when on the 2nd monitor the drop down menus are really bugged. They flicker to start then become unusable. I use 3 monitors and it's only on the 2nd monitor that it does this. I can't think of any recent changes to the computer that would cause this to start happening =/. I run Win 7 64 bit. Intel Q9550 2.83ghz with 8 gig memory. Graphics card is an NVIDIA GeForce GTX 295.

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