I'm having issues downloading library books onto my nook using adobe digital editions. I've tried two different nooks and multiple books. The book opens fine in adobe digital editions but won't open on either nook. At first, I was getting an error message saying I was trying to open a book that had already been returned (I wasn't, I tried this on multiple different books that I'd just downloaded). I de-authorized and re-authorized Adobe Digital Editions but I'm still getting an error message when I try to open the book on my nook only now it says "User Not Activated". I was using everything just fine a couple months ago so not sure why it's not working all of a sudden.