I found the cause of the problem: besides my Unity plugin the Desktop Wall plugin had been disabled as well. Enabling it via CCSM (and ignoring some complaints about conflicting plugin settings involving something like Flip up/down or so) resolved the issue.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to compiz in Ubuntu. https://bugs.launchpad.net/bugs/1228352 Title: [regression] Alt-Tab for all viewports will not switch viewports when selecting a window on another viewport Status in Compiz: Fix Committed Status in Compiz 0.9.10 series: Fix Committed Status in “compiz” package in Ubuntu: Fix Released Bug description: When enabling Alt-Tab for all viewports (instead of only Alt-Tabbing on the current one), if you select a window that is currently on a different viewport, that viewport will not be automatically switched to. This also occurs when using the Launcher to select apps in a different viewport. To manage notifications about this bug go to: https://bugs.launchpad.net/compiz/+bug/1228352/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
