I am having this same issue currently. WDTV goes out and grabs the metadata, including backdrops, and movie info but does not display the the thumbnail in Gallery View, even though the backdrops are being displayed. Manually getting content does not fix the issue either. Interesting thing is when I just added a single share with 15 or so movies it displayed the thumbs with all data and back drops. When I added the 2nd share with approximately 120 movies, it is displaying no thumbs for this share but still displays the thumb for the first share I added. Both are NFS shares. Any help?