I just experienced the issue again. I have attached the same Xorg Log after applying the workaround mentioned in the original post.
** Attachment added: "Post Issue Xorg Log File" https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1175279/+attachment/3661731/+files/Xorg.0.log -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1175279 Title: Focus gets stuck on the current application To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1175279/+subscriptions _______________________________________________ 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