I'm trying to get the compositor working but I seem to have picked up a bug. As soon as I click 'enable display composition' everything seems to vanish, almost as if xfce crashes completely. Although I can still move my mouse around my grey desktop and the cursor changes as I hover my mouse over my panels and different windows.. Which seems that everything is still there.
I've tried restarting xfce when this happens and it loads correctly. I even hear the system beep when the xfce tips load but nothing can be seen. It's almost like everything still loads and is still there but it's just full transparency.
This is really weird - What Xorg driver are you using? Can you attach the Xorg.0.log?