The problem is it seems not all HD tracks can be played (in that the AC3/DTS cores are extracted). The sample you tried worked, and so did a sample I tried previously, but the one I posted from the demo site does not seem to play.
Is there any way we could get some sort of a list of exactly what the WDTV can and can’t play? Both files had TrueHD tracks, why would one play but not the other?