I've been working productively again. I had one really good night and a few so-so nights, but at least I've finally paved over the pot hole, that spot where my story kept sticking. I've bridged the transition and am on to the new stuff that's so much more interesting. It's fun again!
Note for future reference: when the story gets stuck, ask if you have enough story! Turns out the solution was I needed to add some other plot elements. I added two big events that give much more momentum to this section of the story. Now I can enjoy watching them unfold!