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I think the EFI update is doing something that Parallels doesn't like.. if you reinstall OS X you will work again for a limited amount of time...
have you also recently just installed the MAC updates? and the EFI one?
Also have this issue, I'm wondering if it is the update or if it is Apples's latest updates.. have you installed the recent ones from Apple ?...
I think there's something major going on right now with Parallels, but I think it maybe Apple that have messed both vmwear and Parallels up with...
