Problem with rendering

I have been working on a crater model and camera track to place it onto footage. I let the program automatically setup the tracking scene, and the rendering was working fine, but i didn’t like how my image looked, so I switched to cycles. I redid all the materials, and tried to render it, but it ended up just being the model on a black background. (I’m using the 2.64 test build if that changes anything) Any help would be appreciated.