The image in the first post, is that a message from within MC? If so, why is MC retrieving files from a DLNA server? MC is the DLNA server.
I'm wondering if the Marantz is, in fact, acting as a DLNA Server. The server should disappear when the Marantz is turned off, but sometimes a DLNA server seems to "persist" in the list of devices. If the Marantz is turned off and MC is restarted, or maybe even if the laptop is rebooted, does the DMS (DLNA Server) disappear from within MC?
I'm thinking maybe;
The Marantz is seeing the files on the laptop and acting as a DLNA Server to serve them.
MC is connecting to the Marantz as a DLNA Controller.
MC is pushing the audio to the Marantz, which is acting as a DLNA Renderer?
That may all sound silly for all I really know about DLNA, but that message in the first post doesn't make sense to me.