It really should be that easy, at least it was for me. The one thing I can think of might be the version of id3 tag. I have musicbee set to write both id3v1&v2 and it works fine. I remember others talking about a utility for mass tagging, but can't recall the name (mp3tag maybe?). Search here in the forum and hopefully you can find some more info.
I guess the best thing to do is experiment with tags for 1 album till you find what works, then do the rest
Edited by Mr Trev - 12/24/13 at 5:07pm