Comment 4 for bug 728423

Same problem here, with an interesting detail: if I slow down the fade time on the shift switcher using CCSM, I can see the corrupted panel cross-fade with the normal panel during the transition.

So when I hit the key to initiate shift switcher, the panel immediately goes corrupt, but as the windows transition into their place in the shift switcher, the corrupted image fades back to the correct panel image, so that the panel looks correct while the shift switcher is active. When dismissing the shift switcher the same transition happens in reverse: as the windows transition back to their places on the screen, the correct panel fades back to the corrupted one. As soon as the transition is over, it immediately goes back to the normal panel.

Observed with both the intel and radeon driver on two separate machines, so it doesn't seem to be driver-specific.