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Working a lot better for me this morning.
Quoting for emphasis - this is exactly the problem I am now experiencing with Parallels 8.
The flickering issue (For me atleast) is solved in Parallels 8. However the second screen is laggy and the cursor not so accurate when moving...
OSX update has not fixed this issue for me either.
Will parallels 8 fix this issue?
I am also experiencing this problem in a variety of windows VM's. Disabling 3D acceleration and moving my osx menu bar to the appropriate screen...