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The latest update to parallels fixes the login screen issue, in a way: the login screen is now centered in the middle of the screen, undistorted,...
Found this thread on the Ubuntu forums which sounds like it's describing some of the distortion problems I've seen, and pins the issue on the...
I've seen the same thing, so you're probably right. Glad to know others are seeing it, too.
Running Ubuntu 11.10 in the latest Parallels 7 with OS X 10.7.2 as a host, I find the login screen is distorted when I start Parallels up in full...