When I switch to S-Video, the image displays perfectly on my screen.
When I swap out the component cables, and connect them to my other DVD player, it works fine - perfect image.
Disconnect them from my old DVD player, plug them back into the Oppo, double image in black and white again.
So. The cables are fine, and they are connected properly. It's not the TV, because it displays fine when I plug the cables into my other DVD player. I cannot find any setting in the Oppo menu that seems relevant to this issue. Anyone ever heard of this before? I'm baffled.