Black Render in 2.49

I’m trying to render a scene in 2.49 on Win64 and the render keeps coming up solid black. It renders the default scene just fine, but when I open the scene I want to render, it’s black, and I can’t figure out what’s up. I’ve tried:
1.) Making sure there’s lights in the scene and on the right layer.
2.) Making sure there’s no fog or object covering the camera.
3.) Changing several materials to high emittance just to see if they show.
4.) Rendering as animation rather than preview.
5.) Deleting the default camera and adding another somewhere else.

Any other ideas? I’m stumped.

OK, I loaded all the objects and lights into a new scene and it’s rendering fine. Gah–it freaks me the heck out…