An updated version of Dreamcast Media Player has been released that fixes a bug that happened when trying to play certain DivX files. It can be downloaded from Thenesis.com, you’ll need a coders cable to be able to play it.
Thanks to Huma for the news.
By the way, for those that weren’t sure about it, this DivX player is different from the PocketPC DivX port that is being talked about in this thread over at Project Mayo.