It is not behaving the way it should and I can't really diagnose why from the limited information provided.
I would try deleting the winfilecache .dat file with DW closed and see if that fixes it. If not, try it with a different template or no template to see if it is something about the template causing problems.
Once you have narrowed it down a little, post a support incident and/or post back here and I can try to analyze the symptoms or files involved for instance if we determine the template somehow is the cause.