I have a similar issue. I also copy all the datea from the PC to the NSL. When I create a playlist in itunes and copy the xml to the mp3 folder on the NSL some files are visible in the playlist while others don’t.
Any idea?
Andreas
EDIT: It looks like my problem was the UFT character issue similar to:
http://forums.rokulabs.com/viewtopic.php?p=75095&sid=573fac7caeda1c2ad94fe127502961db