Did you check to see if you have a folder called inprogress? Make sure it is not a file. If you see a file called inprogress, delete it and create a folder called inprogress.
If this doesn't work, then try re-compiling the map. Once you open up BSP, load a map, and compile it, for some reason, it will try to compile a map called default. If you compile it again, it will compile the map that is open.