Ultra 6 and Tivo Streaming

Hi, Im having the same exact issue. If you figure this out, would you mind relaying? I've setup the readynas (ultra 4) and installed mydnla and mytivo app's. Also my tivo connection was successfully installed during the initial readynas setup. When I i go to my readynas connection, through my tivo, not of my movies are there to play, even though they are on the readynas. I have no problems watching movies on my tivo that are hosted on my pc, through tivo desktop. For whatever reason, the readynas does not recognize them. Most of my video files are .mkv's and .avi's. Thanks!