Sorry...don't have a clue. Tried changing from RGB to grayscale and couldn't determine what would make it green. Maybe it wouldn't hurt to look at Adobe's forum:
...

also...check out the Gnomon tutorials/DVDs.

What has helped me most is the Maya 7 Foundations book and the lessons that come with the software. Once you have the basics, other online tutorials make more sense.

I have checked out...

You say you have adjusted the color settings...have you looked at the RGB channels? Make sure your all channels on (Red, Green and blue)