My Seagate media player will now play an AVI file, but gives an error trying to play mp4/m4v files from the N9 over DLNA. (Just a circle-with-line-across icon) . The same video files work fine if I just use USB instead of DLNA.

I have managed to get a video streaming from N9 to N900, but is keeps pausing for buffering.
Same problem using rygel on my PC and on N9, so I suppose that is a client problem.

0.8.3 on PC. Back-end? Isn't rygel the DLNA backend?