Hello. When I try to use two displays with windows 7 i'm getting this weird flickering on the external monitor. Basically when I try to click on something on the external monitor I will briefly see the main monitor displayed just for an instance, but repeatedly. It flickers. I'm using a macbook pro (last year's) with mountain lion and windows 7. I was not getting this issue before i upgraded to both Mountain Lion and Parallels 7, but I upgraded both on the same day so I can't be sure which one is causing issued. Any ideas or help would be appreciated.