Ok, it appears to be the lights. Odd, since I don't have any "yellow" lights in the scene...but anyway.

It appears to be not a single light, but where the diameters of two lights intersect. As soon as the door hits where the two lights combine...it "highlights" ...dramatically.

So, yay for a solution, but please someone tell me I'm doing something wrong and that you aren't forced to avoid intersections of lights hitting map ents with the engine.

Thanks again,
Todd

p.s. and for the record...if my lights have any 'tint' to them, it would be blue, not yellow...strange.