Here is one example, where the stream works in Dharma 10.1, xbox xbmc, and windows media player but does not work with nightlies. I found a lot of mms: files from various websites on the web that fail to work only on the nightly builds including a NASA and National Geographic stream, which I can't find anymore.
02:18:36 T:3044 M:2026336256 NOTICE: DVDPlayer: Opening: mms://mms.hebtv.com/tv1
02:18:36 T:3044 M:2026328064 WARNING: CDVDMessageQueue(player):
ut MSGQ_NOT_INITIALIZED
02:18:36 T:6076 M:2026291200 NOTICE: Creating InputStream
02:18:36 T:6076 M:2026274816 NOTICE: Creating Demuxer
02:19:06 T:6076 M:2032361472 ERROR: CDVDPlayer::OpenDemuxStream - Error creating demuxer
02:19:06 T:6076 M:2032353280 NOTICE: CDVDPlayer::OnExit()
02:19:06 T:6076 M:2032349184 NOTICE: CDVDPlayer::OnExit() deleting input stream
02:19:06 T:3044 M:2032398336 ERROR: Playlist Player: skipping unplayable item: 0, path [mms://mms.hebtv.com/tv1]