Has anyone else had problems using iBooks after they performed the jailbreak for iOS 4.0. Before I jailbreaked the phone, iBooks was working and I could view my books. Now after using redsn0w, I am unable to download books from the store and I cannot sync books that I have on my iTunes to the phone. It also keeps on asking me for my itunes sign in and asks for me to sync. It keeps on popping the same message over and over. Is there a fix for this?