Another heads up, that's exactly the problem I had. I had renamed both the default app delegate and default view classes given in the startup OpenGL project, and never updated the references in Interface Builder.
I kept getting a GDP Exeption that my glView property/outlet (because the default view type was changed, and so didn't exist anymore) could not be key-value coded, or something like that. It was dynamically typed so it never threw a compiler error. Also, I had renamed glView to gameView, and it didn't update in IB. God, I hate Apple.
Anyway, if that is your case, you have to go to interface builder and change the "Class" in "Identity" of each invalid object. Then, make sure all connections are valid and correct.
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