Before I tear into things and try to see what's wrong, I thought I'd solicit
opinions on potential causes:

Problem: I went up to Yosemite the other weekend. It was butt cold. I opened
the regulator valve to my propane tank to make breakfast (fridge really
wasn't needed), and propane started leaking out of the assembly. It was butt
cold. After realizing that propane was engulfing me, I closed the valve and
proceeded to use my backpacking stove for breakfast. Again, butt cold.
Yesterday, back in the central valley of California (not so cold) , I dared
open the valve again. It seems fine and there is no audible or smellable
leak. Any thoughts before I dig in?