Pretty difficult to know what's going on without some debugging.
First make sure it's not hidden in MC for some reason.
Right click on the "Player Zone" under Playing Now in MC and go down to the entry "Show/Hide Zone->Hide" and make sure it's not hidden. If it's not, proceed to the next line.
Install UPnP tools for developer on your PC and use the Device Spy tool to get the Description.xml from the rendering device and post it.