VLC cant stream some of the mp4 files, like the ones from the release group ASAP. And the JW (flash) Player cant steam some of those files either until the entire file has buffered/downloaded.
Install the latest version of the Divx Plus Web Player http://www.divx.com/en/software/divx-plus/web-player
and try using that to stream the mp4 files. It works for many users, but not for everyone. If it's too problematic you can always remove it and reinstall the older more stable version, but the old one will only play avi files.
You could always just download the video, then play it in VLC once the download has finished. You'll never have a problem playing a video with this method, however you will need to exercise some patience waiting for the download to finish. If you cant wait, then you'll have to deal with all of the problems that come with streaming.