While running os 5 I was having trouble with ibooks. Books that I had already purchased, downloaded and read started appearing in my library with an empty download bar and could not be opened. I tried downloading again from itunes but no success. I deleted and reinstalled i books but no success. I then updated to os 6 and no success. Then I repeated all of the above and still nothing. I have one book that I can read, delete and redownload successfully (which I purchased about a week ago), all the older stuff is frozen.
Any thoughts on what might be happening and how I can fix this?