raise/lower window turns window white since last update

Binary package hint: compiz

I have assigned raise/lower windows in the general settings to some extra buttons in my mouse.
Since the last update (to version 1:0.9.4+bzr20110606-0ubuntu1~natty1) whenever I raise (or lower) a window, the entire window (except the decorator) becomes white. It happens with terminal windows, browser, whatever. I have to drag the window a little bit to make the window contents visible again. I am using XFCE, compiz, and emerald on a 64-bit natty installation.