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I had this problem but I solved it by uninstalling Parallels Tools (from Control Panel > Programs & Features) and then reinstalling Parallels...
Ubuntu 12.04 works for me Thanks for the warning about Ubuntu. I backed up my VM before I tried it. My Ubuntu 12.04 (created in Parallels 7)...
mouse pointer I have the same problems with dragging windows across two monitors. Thanks for the tip about the mouse pointer. That works for me too.