I have exactly the same problem. This is on Precise. After having all kinds of trouble (frequent random X freezes) I did a "reset to defaults" of the unity profile using Compiz preferences. Had to rebuild my settings after that, and that's also when move to workspace stopped working.
-- You received this bug notification because you are a member of compiz packagers, which is subscribed to compiz in Ubuntu. https://bugs.launchpad.net/bugs/885070 Title: "Move to Another Workspace" causes window to disappear To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/885070/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~compiz Post to : [email protected] Unsubscribe : https://launchpad.net/~compiz More help : https://help.launchpad.net/ListHelp

