Downloaded last night and it played brilliantly. Booted it up this morning and I can't get through the menus without all sorts of black flickering and screen tearing until the screen fills with black. Jumping from one menu to the next temporarily fixes it (for a few seconds) and the game actually plays, but the the tearing kicks in immediately on the map/menu screens. Not happening with any other game. Uninstalling does nothing.

Can anyone help?