Thanks for the reply, guys!

For the record, I did in fact check my keyframes, and they definitely DO go on and off when they're supposed to...but ONLY in Maya! Again, it is only after a batch render that I get this strange result! :-)

I am going to first try activating the default lights and re-rendering, just to see if that might have been the problem (probably not, but you never know). Otherwise, your suggestions are quite valid. I don't wish to move the shot any, so I will probably go with a "cardless" render!

It just puzzles me why this would happen in the first place!

Thanks again!