I'd been stuck on a meeting scene in Chapter 7 of The Ballad of Katie Hart for ages. When I tried to move it forward, the dialog fell so flat that even the character in question commented upon the leadenness of his words.
And then I realized that the whole first part of it was solitary introspection on his part, which meant that there was no really good way to switch gears to interaction -- and it was made even worse by the first interaction being a formal address to the group as a whole, rather than interaction with any one individual.
Finally today I had a chance to sit down and rework it. After several false starts, I finally got a good beginning conversation going, and from then it was almost astonishingly easy to keep things moving forward. It also helped to have another character in the meeting scene burst out with a question, so that everyone started chiming in instead of politely waiting for the meeting leader to speak.
It's not perfect, and I need to see how it dovetails with another scene. But at least I think I finally have something I can work with.