It is very frustrating. I have a DSM-520 and a DNS-343. I bought both together because they are supposed to be compatible. The file order stinks! I made sure to have the latest Firmware and still nothing sorts correctly. I called D-Link, but the people at D-Link can't answer my questions. They say I have another computer running on the network that is screwing with the file order, yeah, that's probable. I have reworked all the the ID3 tags for every song I have to make sure the server reads the order correctly. But it does not. D-Link products stink. The service is terrible. I will never buy another D-Link again. All it takes is an ID3 recognition in the software, so it can recognize genre, album, artist, and track number. All I want it to do is browse like Real Player or Windows media player, but it doesn't do it as it was advertised to do so.
The work around is to run the media software on you computer and share from the network drive. It stinks because you have to keep that computer running.
I think I'm going to buy the PS3 and use my DSM-520 as a boat anchor. It probably won't even do that well!