This happens to me too, and has for a couple of Ubuntu releases. Also, the overlapping window stays focused. Today I switched to the workspace to the right, pressed Alt-F4, and accidentally killed a long running MATLAB process in the original (left) workspace.
Running an up-to-date 12.04 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/901530 Title: Grid plugin places windows incorrectly when dragged to right edge To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/901530/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs