...that I can only work on one story at a time? Recently, after working on One Faith (tentative title for my Amish novel) for a while, I found myself thinking of my YAF story. So I just switched over, and worked on it for a while. Perhaps I'll give myself a little flexibility to work on whichever story is happening in my head at a given time.
That doesn't sound very professional, though. It seems to be inviting writer's block... because what do I do when none of them are happening in my head? But the problem has tended to be wanting to work on more than one story, as opposed to not having anything to write at all.
Anyway, this is going to be my new attempt at being more productive in my writing!