I borrowed an e-book from my library and successfully installed it on ADE. When I connect my Nook, it will initially show on ADE as connected, and then ADE will abruptly "disappear" as if closed. When I try to reopen ADE, there is nothing showing in my library. I've uninstalled and re-installed ADE, and tried to deauthorize but it simply tells me that my computer is already authorized and I don't see an option to deauthorize. The problem seems to be the Nook connection tho - I could read and open the book in ADE on my computer (at least, I could before I connected the Nook, after which everything in ADE just disappears). Windows Explorer tells me that the book is on my Nook, but the Nook itself does not seem to have it. I have had no problems in the past downloading library books. Thanks for any suggestions.