Hey everybody,
I originally posted this to the intermediate forum, but I'm feeling like perhaps the answer is so simple and obvious that I should have posted it in the beginner forum:
my original post in the intermediate forum.
I'm sorry for cross-posting; I'm aware that it's bad netiquette -- but please have mercy, I feel like perhaps the question belonged here in the first place!
My heartfelt thanks to all of you who take a look. I'm stumped!
Idan