It dawned on me today why I've been having so much trouble with my current WIP, an Old West horror with a touch of steampunk. The reason turns out to be simple: The story is on the wrong track. In reading over what I've already done, the story is nicely suspenseful up until a certain point -- and then it's not.
So, now I have to rework the story from the point where it went off track. That means a little more than a 1,000 words are going into the trash can. And the submission deadline for the market I'm writing this one for: Sept. 15. Good thing I have a week of vacation coming up in which I can finish it.