Problem with 3d models semi-transparent on iPhone 2G

This is a new problem I’ve been having…Im not sure what the problem is exactly but, I’ll give you guys everything:

I got an animation from a site called Mixamo.com (does animations for you from models you’ve rigged that you can tweak), and put it in the game. It worked fine for the iPad and iPhone 3G…but on the 2G the model is there, and animates…but the center of the model is transparent…like almost an outline Hard to describe without a photo (only happens when I build on the 2G). Anyone know what could possibly be causing this? Never had a problem before with models and the 2G iPhone.

Thanks

Any chance you could post a screenshot of this?