Issue with Yamaha receiver

[daninthemix]

I am definitely up for doing a Wireshark trace, but it won't be for a few days. With the Wireshark trace, perhaps you can clarify the problem and then I can try approaching Yamaha (for whatever good it will do...). Do you know if Plex also uses ohNet for UPNP? That would explain why the problem is exactly the same on Plex as on MinimServer.