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Dieter - Try the suggestion on post #62 to manually remove parallel tools and then reinstall it - that fixed that problem for me.
I'm running Parallels 7 and FYI - this fix (manually removing parallel tools and then reinstalling per the above instructions) worked to fix...
A fix would be greatly appreciated for this. I loved using coherence mode and it has been unusable ever since the the 10.8 update for OS X