I also have a funny problem which introduced itself when switching to Gotham from Frodo (I think).
In my music library (which I've tagged with
Picard) I have several artists which are the same. It's not that I have (just an example) both "AC/DC" and "ACDC" but I have three "AC/DC", in other words the exact same spelling and tags.
Have re-done the tags on the artists with this problem and the
"albumartist", "albumartist sort order" and "artist sort order" are the same on all the files. The only thing different is the artist tag, which XBMC doesn't even use to sort after. (correct me if I'm wrong)
I even double checked in other tagging programs and the "albumartist"tag is the same on all the files.
Have I missed some new setting when switching to Gotham or am I doing something else wrong?
Here is my log: http://pastebin.com/rHC2tLci
The artist in this example is Aidan Baker, which i get two exact copies of in the artist view.
artist - Aidan Baker
albums - Fantasma Parastisie
and
artist - Aidan Baker
albums - Lost in the Rat Maze
Any help would be much appreciated