I'm getting black borders top and bottom on my raw Nef (Nikon) files when I view them in Bridge. When I try and enlarge them in the workspace using the slider or the keyboard shortcut they won't enlarge. I don't know how to correct this. I don't have the same problem with tiffs or jpegs.
For reinforcement, a basic tutorial video on setting favorites and image ratings can be found on the InfiniteSkills blog: http://infiniteskills.com/blog/2012/08/adobe-photoshop-cs6-tutorial-fa vorites-and-ratings-in-bridge/