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Just updated to PD8 Build 8.0.18101 and its still not fixed yet :(
I have also upgraded to PD8 for Mac. Running Parallels on Desktop 5 and VM's are launching on Desktop 1. It was happening with the most recent PD7...
kdgone, I have been seeing the exact same behaviour here with Ubuntu 12.04 and the flashing Unity bar etc. I installed Fedora 17 to test that...
Just installed Win8 Dev under Parallels 7 and its running fine. Did not install the parallels tools.