I finally got rid of this problem by reverting Compiz to its default settings. I disabled Unity again and re-enabled many of the plugins I was using and the problem has not reappeared. Attached is the backup I made of my Compiz settings *before* I reverted. My guess is that the problem is in one of these plugins.
** Attachment added: "compizsettings.profile" https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/777669/+attachment/2119571/+files/compizsettings.profile ** Also affects: compiz Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers in Ubuntu. https://bugs.launchpad.net/bugs/777669 Title: Invisible window blocks mouse interactions with visible windows after upgrading to 11.04 _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp