I took a leap of faith that failed ... I upgraded OSX to 10.6.3 (GA build) and Parallels 5 to Build 9344 (now that the Outlook compatibility issue has a patch available). All my Windows 7 VM's have ground to a halt and won't display video. When they restart, the BIOS sheet displays then all goes blank. The Windows start-up sound plays find, and a mouse pointer appears in the middle of the window but is not responsive. Any start-up programs in Windows appear to load (and appear in the OSX dock), but are not visible as windows in teh VM window (whether Window, Full Screen or Coherance mode). Windows XP and ChromeOS VM's work fine ... I attempted to create a new Windows 7 VM and it worked OK until I restarted the Mac and it too has the same video issue as the other VM's. Has anyone else experienced this issue, or have a recommended work around. Parallels team - problem reported with ID 4443630.