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I share a VM between different users on my Mac Pro. The VM is always shut down between uses by these users, and it's stored in a "Parallels"...
If figured out what the problem was - I had connected an external drive through eSATA. Apparently, Parallels doesn't much care for eSATA drives...
Sometimes, on my Mac Pro, Windows Vista will stop responding to any user input - appearing "frozen" - until I command-tab to some other program on...