Comment 7 for bug 947259

I can update and say that it happens on _every_ startup and it does not seam like it looses the keybinding during the session thats running.

By just adding 'super+shift' to 'alt+tab', pressing ok, then removing them is the solution. (Don't choose 'ctrl' since then you need to remap by redoing the keycombination, ie. the ctrl does not dissapear.)