Assuming you are talking about the Chamsys MagicHD we checked the specs and those specify that MagicHD supports thumbnails and previews over CITP. The previews is what the Visualizer needs to display so it looked alright.
To be sure, we downloaded and installed the latest version of the MagicHD and tried to make the connection. Unfortunately this failed.
We managed to track the problem down to incorrect values being sent by MagicHD and therefor the MSD Visualizer won't see the MagicHD as a media server.
We have notified Chamsys about this issue.