I have some MP3 files whose tags are not being read correctly either, though I think that might be the ISO-8859-1 vs UTF-8 issue, so I’m going to run those through MusicBrainz Picard again soon with the appropriate options set.
However, I am also having trouble with some Vorbis tags. Using .22 firmware, in case anyone wonders.
In this particular case, the artist shows up as “Unknown” on the Fuze. I used the vorbiscomment command to move the tag from the actual music file to a sinewave ogg file so that I can post it here without fear of copyright infringement. :) But here it is: