I just bought external monitor in which I am running Windows 7 in full screen mode (2560x1440). I get a big graphic mess every once in the while when parallels is extended into full screen mode (picture attached). This behaviour is little bit weird though. First of all, I think this occurs only after the mac has been in sleeping mode. Also, when Im switching screens in mission control, desktop can be seen perfectly for two seconds before the graphic mess occur. When Im exiting the full screen mode, it works perfectly again regardless of the screen resolution. Also, if I use the full screen mode on my macbook display, it is working well. I was wondering if it would be cable problem but Parallels becomes really slow at the same time as well (even though the OS X is working well). I ran DirectX diagnostics and that didn't give any error messages. Thanks for the help in advance.
