Has anyone experienced a problem with the rear back up camera display? I have had my vehicle in to two different dealers in the Chicagoland area and they haven't been able to find the glitch. It was an intermittant problem with the display ocassionally getting a garbled picture while backing up. Now there is no picture at all. They have changed the camera and the control module in the trunk with no change. All the other display functions work perfectly. I'm interested if any one has experienced similar problems and what was done to resolve it. Thanks!