According to various observations in this bug report (especially #15 and #16), I believe this is not an X server bug but a bug in Metacity.
** Package changed: xorg-server (Ubuntu) => metacity (Ubuntu) -- 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/778083 Title: Switching workspaces does not always redraw everything necessary To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/metacity/+bug/778083/+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
