This morning I had one of those "Ohhhh!" moments of writerly epiphany, when I realized why I've been finding the last three or four chapters of the Work-In-Progress something of a struggle, where the run up to that point had been really fairly easy. It's because I screwed up and shouldn't have written those chapters. I took the story in entirely the wrong direction, and I've ended up in this awful spot where nothing's been happening; just a whole lot of exposition and introducing my main characters to new people for four chapters.
The good news about the epiphany is that I know exactly what I did wrong and where I did it. The bad news? I've been working on Chapter 13...and now, tonight, after I re-read the thing to refresh certain details in my head and prime the pump, I'll be back on Chapter 9. Oh well.