I have this problem too, using ubuntu 11.10, xfce desktop, compiz. problem appeared after i installed fglrx driver for my ati card, i read some other people who have this problem also have fglrx driver, so there is something related between this bug and fglrx driver.
here http://ubuntuforums.org/showthread.php?p=11258898#post11258898 ~!geek!~ found a solution to not experience the problem again, but can't say fixed it: open CompizConfig Settings Manger > Application Switcher > General tab > uncheck Mipmap (sorry for bad english). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/791110 Title: compiz Application Switcher mouse/screen focus issues To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/791110/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs