Thank you muchly, both!

And no, I go into the MAT room, select the object (the eyeball for example), and then attempt to apply the particular image map in a few different channels, and the eyeball on the render continues to show as white.

I am more concerned that I am unable to apply MAT poses from the side menu, and less so about the  more detailed MAT room work.

Edit: I have some Cherry Bomb images that have been kicking to get out...this is what primarily brings me back))