Quote Originally Posted by GMT
I think this might have something to do with the sprites cuz I had the exact same problem you descibe after installing the sprite pack a while ago, hope this helps!
I can confirm that the missing sprites of the spritepack caused random CTD's, but this happened in custom battles as well as campaign ones.

Come to think of it, they may not have been that random. As I recall it, the game crashed when I loaded the custom battle the first time, but not the second. However, this was some time ago so I am not 100% sure of it.