Well I finally got the expansion (The Burning Crusade) and I saw some of my race to races weren't working, except one... Night elf male to blood elf male, I was playing on him for awhile, and I had the Expansion... and for some reason I got a error about the Night elf character... and the ones that weren't working were...
Troll male to Orc male (Orcs look good as a shaman)
Gnome Male to Blood elf Male (Pathetic little gnome was strange...)
So I'm thinking you will get some errors with some model edits...
and if you are getting the same... I got some suggestions that might help but I didn't test...
1. Take out all Race to Race Edits from the data folder and put them back in
2. Delete Modelchange.exe and redownload...
Thats all I can figure out how to get them to work...
and if you aren't getting this error and you just got BC and didn't play a Blood elf or Draenei, try playing one for awhile and you might get a error once in awhile...
Don't ask me what this is about, just helping as much as I can so Race to Race will work for anything.
<---- Some of you after you read some of this Hehe...
That'll be all...