Arch as guest with compiz (or kde) in virtualbox: no expo effect

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https://bbs.archlinux.org – Hi archers, I couldn't find anyone in the net with my problem, so maybe some of you can help.The thing is that when using Archlinux on virtualbox as a guest (3d acceleration enabled in Vbox, guest additions installed) I get it to work, except that fullscreen effects do not work: When I call the expo effect, I get a black screen, until I go back to the desktop view. The same happens with changing the desktop, I should see a transition  but what I see is a black screen for a fraction of second (when de animation should be taking place) and then it shows the other desktop. The non-fulls (HowTos)