Just got this fixed. Thought I'd post how.

Firstly, a while back I downloaded a contribution of buttons from zen-cart. I liked the look of them. These buttons, I began to alter the color of them from white to green, but didn't complete the task. I recolored about 90% of them. The buttons that were not yet altered were the culprits. They just weren't being read on certain browsers AFTER logging in. Why? Can't tell you that. It really seems to make no sense at all. But when I colorized these and reuploaded them, viola. Fixed.

Cris