I've noticed a problem today. If one has previously checked out a book using Adobe DE and tries to load it into Bluefire, the book can't be read. It shows up with the circle with an line through it. If you download a book that hasn't been downloaded before, it works perfectly.
I've verified this with three different books. Also, if you load a new book, then return it, then try to reload it, it doesn't work so you can try for yourseld to see if this behavior is happening to you.