I had one of those when I was making a nintendo ds game and trying to get animated sprites working. I got one working great. Then i added a 2nd, figuring itd be simple. Nope. Instant crash. So i removed the 2nd sprite. Crash. Wtf??? So i cleaned the project and built again and it worked. Until i added a 2nd one and had to remove it and clean it again.

Once i looked into the code(issue with ptrs), i had NO EARTHLY IDEA why the first sprite worked at all!