OK, so the 1080p from Usenet doesn't work for me either, neither using MPC nor using VLC. Neither does the intro. Yet the extras do work. I don't get it. Have you done anything different with the encoding? All I have is sound.
edit: Okay, so it does play on another version of MPC. But it still doesn't on my Dune HD Max, except the audio. So there's definitely something with the video encoding that ruins compatibility with many players.