Need Help with BlenderChar Eyeball Tutorial

I followed the BlenderChar eyeball tutorial pretty much step by step as far as I can tell, but somehow am ending up with this slightly weird result - specifically the halo in the center of the cornea. It is on the cornea layer, I have tested. I just can’t figure out what is causing it or how to get rid of it.

Any help would be greatly appreciated. Thanks!

EDIT: Further investigation seems to indicate that the black circle in the center of the halo is because sub-surfing is causing a whole - the black spot - to appear. How do I get rid of that?

http://www.nuance9.com/blender/eyeball.jpg

Man!!!

I figured it out - well sort of.

I found this light way off in the scene that I had been playing with a while back, but was not currently using. I deleted it and - all better. I think it was like a sun lamp or something. Not sure how or why it was causing the odd things that it did.