read my post just above
I have the same problem. And I have the problem that the path is always cut short.
At the point where I need to tell DFP where to upload the files, I click on the folder icon and drill down to the folder name, lets say asset/media/mediaset/
In the end DFP insists on path called /asset/media/ omitting "mediaset". I again have to fit this in manually.
I don't know if this last one is a DFP problem, though...