Ok, I had a look... the issue is:
The empty paradePreview tag in the generated XML.
I have no idea where that comes from... I guess I will keep investigating. :-D
For a quick fix try removing/commenting out lines 31 to 44 of file /assets/templates/Playlists/Audio.xml, like...
This might be caused by you not having any thumbs associated with those tracks - is that possible?
Any chance to show more of the logs, starting from the incoming ATV request, the PMS XML received to the aTV XML (last one was already shown)?
