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I would like to confirm that I've also been experiencing this issue since 15048. I'm still experiencing it with 15063.
Uninstalling Parallels Acces resolved the same issue for me on a 15" rMBP (2012). Thanks!
Parallels 10 appears to launch fine on 10.10, however.
It looks like Parallels 9 will not launch on my Mac Pro with the Yosemite Beta 2. Is anyone else experiencing this?