I'm getting this message when trying to switch from Full Screen to Coherence mode: "Unable to switch to Coherence. The virtual machine display configuration could not be applied. Please try again or contact Parallels Support ..." I tried again but same error. I looked at the Windows Device Manager and don't see anything flagged. Running under OS X 10.6.5, Windows 7 Ultimate with 1GB allocated, Parallels 6.0.11828 on iMac 27" 8GB. I've generally been running full screen and haven't tried Coherence for a long time so I don't know if this is an issue with the recent OS X 10.6.5 upgrade or not. I'd really like to get Coherence working as I really hardly ever use Windows anymore but I would like to have the Oxford English Dictionary, which unfortunately is Windows only, running in a window at all times.