The biggest problem with my work in progress is that I have none. This is mostly due to the fact that I don't have an idea for one. Needless to say, this makes writing a novel difficult.
It's not that I don't have ideas. I don't have ideas that are (a) good and/or (b) are something I want to write about. I had one fairly decent idea for a political novel, but it was very time-critical and is now, as we used to say at the Very Important Organization, "OBE" -- meaning, "overtaken by events."
It's bad enough that I have trouble coming up with the plot for an idea; if I don't have an idea to start with, I've got nowhere to go.
Where do all you smartypants writers who are always working on your WIPs come up with your ideas?