CompuServe Messages

Odd things are happening to my 3DS4…I suspect it's a switch that I've turned on, or something…when I render from the keyframer, even as simple as loading BIRDWALK3, render the camera view using default settings, the lighting in the scene is OK for the first frame, then gradually gets darker and darker until only CERTAIN colors (ie/ neck, head, body & legs colors) remains after 5 or so frames…it's doing this on ALL of my animations!!! What gives? All was working fine, but as I say, I must have tripped something… Thanks, in advance. Lance