I still cannot open a book on my Nook Color. I have always been able to download it through Overdrive, borrowing a book from my library. Then I download it onto my Nook using Adobe Digital Editions (ADE). When I do so now, it indicates the book loading, but I only see a blank white page. Finally, I get a message about too many authorizations or activations. I was told to go to ADE and click on File, then authorize the Nook. It has been authorized for several years. The only options I'm given is to DE-authorize it and re-register. I hate to do this as I have lots of externally loaded books not purchased from B&N. Help, please!