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I ran into this problem with RC2. The issue is with OSX itself. I physically removed the Paralells network adapters from OS X, reinstalled...
Just bumping this back up as Parallels has become completely non-functional for me. I did some more testing, and turning off the second monitor...
I'm running the RC of Parallels and everything has been working well (started off since Beta1). I recently added a second monitor to my 20" iMac...