I just upgraded to Ubuntu 12.04 (from 11.10) and I am the Desktop Wall Plugin from Compiz. My bindings for Move Left, Right, Down and Up are Ctrl plus the corresponding arrow key. Since the upgrade, when I press Ctrl and an arrow key my background image is visible for an instant and then the desktop is switched. This is very annoying as my background image is very bright and flashes me every time.

If I switch my desktop and hold down the Ctrl key and press another arrow key the glitch does not occur.

Is there any workaround for this?