[A Guestpost by T. S. Bazelli]
Help, I don't know what happens next!!
This is a problem for both pansters and plotters, and trust me, I've been both. No matter how you write, it's likely you'll discover gaps in the plot while you're in the middle of writing. I'm not talking about writing block, but story blocks, when suddenly you've run out of plot, or don't quite know how to get to the next part.