Tvheadend

I don't get any audio output on HD channels when running Tvheadend with XBMC, and trying to stream the channels through Mplayer or VLC or the VLC web plug-in doesn't load the HD channels at all (SD channels load fine with VLC or in the web plug-in). The channels are in a test-phase transmission, but I got one of them working with sound through XBMC using VDR, so I think there's something that might be a bug with Tvheadend. I know this isn't a complete bug report so let me know what additional information or logs I can provide to help diagnose this problem.