Comment 8 for bug 886553

OK - the clock on the dock is anywhere from a minute to 10 minutes old depending on the screen shot. I'm thinking its not compositing the image correctly because its not locating the individual pieces that are being composited. This worked under Ubuntu with Compiz. I'm using the default WM now. Compiz does not seem to run correctly :/ Windows don't move, but screenshots now work.

This might give a clue as to how to fix the bug. Its the window manager.