Some of us have recently experienced writer's block in the course of writing prose fiction. So it's time for a suggestion: if a plotline is deadlocked--switch to a subplot.
Imagine, for example, that you are writing a novel about a sister and brother who have both graduated medical school, and are starting internships at two different hospitals. Imagine that you have set out to focus on the sister for more of the time than on the brother. Now, suppose that you are developing a conflict between the sister and a hospital administrator; the situation begins in March, and you intend for it to be resolved one way or another in August. But what if, having taken events as far as June, you simply CAN'T figure out how to carry this plot thread the rest of the way?
It might help to cut away to the brother. Even if his current experiences have no bearing on his sister's difficulty, he's a character in his own right and deserves some attention. While you are making up events to happen to the brother, the corner of your brain dedicated to the sister will be "sleeping on it," and may spontaneously hit on a way to continue her plot arc. Or you might more deliberately devise a way that the brother's experiences DO end up affecting his sister's situation, thus breaking up that logjam.