I have had my nook for years. Always taking out library books to read on it. Last few months I keep getting error messages. While the book shows up on the Nook in my library, when I try to open it I get error messages. Not always the same message, but today it says "Loan token not found". I have unauthorized my nook and reauthorized it, deleted the previous version of ADE and loaded the latest, rebooted everything.