When I write tag data to large batches of files, Mp3tag somehow manages to trick Explorer into thinking the songs are 00:00 in length and only writes the Artist tag, while erasing all of the rest. Oddly, this doesn't happen when I only write tags to one song or to a handful of songs (the most recent incident was with ~250 songs but it's happened to much larger batches).
This wouldn't be a huge problem, except Microsoft software has issues with it. I can't burn these songs to CDs, the playtime tracker on both the Zune software and the actual Zune itself don't work properly, etc. While I've learned to name Mp3s in a format that keeps all of the crucial information stored (%artist% - %album% - %title%.mp3), I would rather have it in tags and show up properly.
This has been going on for quite some time; I've looked around the forum and the rest of the Internet and can't seem to find anything that actually works - aside from reconverting the files, which wipes the rest of the tags (and takes a couple of hours). Mp3tag's a brilliant program and I love everything else about it, but I'm kinda obsessive about my music collection (hence my interest in Mp3tag) and I would like to be able to enjoy it without this issue.