.
Needed? Yes, I... think that would be the word. So I kept tinkering with the griddle. Turns out, changing to a new tank did the trick. The old one still weighs like it has gas in it. But... perhaps... something got too cold to work? Or water in the tank caused a problem.
When it gets that cold, things can go sideways easily. The new tank is working. I'll take the other two in, for an exchange, this coming month. Hopefully this tank will do well. Then again, the other tank lasted me most of the summer. So, it may truly just be empty.