Please tell me what MPD client you're using that catalogues mp3s, reading tags etc? Neither M.A.L.P or MPD Remote recognises them, though then can be played by navigating the files themselves.
@Matt Bartlett @Gr8h8m It's less likely to be the client. There may however be some difference with the files themselves or some other factor on the server side. e.g. maybe we need a specific mp3 tag type. Just for the record my mp3's are also not indexed by genre, artist, album, etc. Navigating by folder is the only option....
My files ONLY have ID3V2 tags...