I wouldn't call it writer's block, since I know exactly where I'm going with chapter 41. But it's a tough one to write. So it might be another day or so yet.
One of (I hope) the interesting things about Chaos Theories is that while the action is pretty chronological, the deeper themes have to do with immutable streams of time. The next chapter is a very strong example of this. The whole thing takes place sequentially as Allen drives east across Pennsylvania, but deals with several loops of time and events that brought him there. The question I have for myself as I write it is how much I can accomplish this without simply being confusing, or appearing sloppy. It may come down to a single sequence discussed within another, or (I again hope) I may be able to effectively do a couple of them.
Of course, now that I've explained it, I've probably ruined the effect. So maybe I'll just tell the story. You'll have to come back in a day or so and see.