Bill,
Just using AE standard lights and now I feel like a dummy. This happened a couple other times and I didn't realize the problem, still uncertain of the exact problem but this turned out to be a layering thing. The thing that throws me off is that the layers were nothing more than other lights.
So, for example, I'm duplicating light 1, self names to light 2, etc, up to 6. The copies appearing from bottom to top in the stack. Somehow, the two lower lights were the ones that turned off, yet if I pulled them up on top of light 6, the damn things worked.
Not sure I understand this one AT all. Literally nothing in between the lights, no obvious solid or other obstruction.