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not work for me. I have tried for many times as you know, the result is not well. I would like to seek all of your help to solve this problem. thanks.I have the same issue the day after upgrading OS X. Here is how I solve this problem.
1 Apple menu, open Force Quit window (keep it open)
2 Launch parallels, you will see Parallels desktop shown on the window
3 Choose PD and force quit.
4 Relaunch PD and then hopefully it works (it worked for me, anyway)
Cheers!