Seems like the download path is getting goofed up, it seems obvious what the problem is based on the error that pops up... Here is the error that shows up in a dialog box:
An error has occurred during download: Count not find a part of the path '\\Tower\Movies\Tower\Movies\300 (2006)\300 (2006)-trailer.flv'.
As you can imagine the actual path is "\\Tower\Movies\300 (2006)\" seems to double up the path to the root directory...
EDIT: I also notice that the Path for each movie is wrong in the Movie Nfo Data panel show for the movie above (300) it shows "\\Tower\Movies\\\\Tower\Movies\300 (2006)\"