When your channel switches to Carousel and only plays black. Locally you can see the Carousel Display Engine is playing. This usually will happen after a power outage or an unclean system shutdown.
Sometimes when there is a power outage or an unclean shutdown of the system, on restart the Matrox Convert DVI Control Panel will not start back up with the system.
On the Carousel Player, exit out of the Display Engine. Go to the Start menu and open the Matrox Convert DVI Control Panel. Wait a second or two to make sure it is running. Then relaunch the Display Engine.