My problem isn't so much playing back video files from local storage (I use mPlayer/KMplayer anyway as xVid often seems very laggy in media player), but in streaming video via uPnP media servers, as per bug#8000 https://bugs.maemo.org/show_bug.cgi?id=8000

Used to work fine, stopped working after updating. Particularly vexing as I'd only had my n900 for 1 day by that point
For reference, these video files play as expected if I download them to the N900 via the media server and play them from local storage, rather than streaming.