We plugged a clients external USB drive in to his BVIS 11 and drive name was recognised as he had named it and it played the AVI files. I have a Mac mini in the showroom and the movie files stored on the Max play through Plex media server using the Homemedia source. Why aren't you using Apple TV to draw the video content via the mac, this is seamless and it has a better interface?
Nice setup with the mac mini. Does it work fine using the mac mini with plex via the Homemedia source?