when i am switching between desktops(one is my windows 7 machine) and my mac envoirnment I get this black screen(when i go into Parallels Control centre and select the Windows 7 VM) please see attached screen shot. the only way to get back to my VM is to suspend and unsuspend the VM.. i then move it to another desktop(so i can get to my mac desktop) and as soon as I do that and then toggle between the Mac desktop and Windows Desktop(using the windows key on my apple keyboard). it will keep doing the same thing. Ive been having this issue on and off now for a few weeks.