I’ve been having a strange problem with some tags. I load up the files in Jaikoz (that have been working correctly) and clear out UserDefined and Ignored data. Then I do a Remote Correct using MusicBrainz after verifying the information and then retrieve the album art remotely. Everything looks good and I save the files.
This problem seems to occur on full albums and randomly as some work fine.
Two I can recall off hand that were messed up are, Beck - Mellow Gold and Beastie Boys - Ill Communication. Anyways if you load them in Windows Media Player it doesn’t read the tags at all and can’t play the file, my Sansa e260 can play the file but artist and album show as Unknown, Media Monkey recognizes everything as does VLC media player.
I have found two ways to fix this, at first I used MusicBrainz Picard and select the option to erase existing tags and retagged it, then opened it in Jaikoz and did the same steps listed above saved again and it worked fine. Also opening it in Jaikoz and changing the option to save in ID3v2.4 allows WMP to play the file again, but my Sansa doesen’t seem to read album art from ID3v2.4 tracks (I think I then saved them back as 2.3 and it worked).
If there is anything I can do to help you look at this please let me know.