We have three Nooks. One of them will show up in ADE when connected to our Mac. The other two will show up as connected to the Mac in Finder, but will not show up in ADE. Interestingly, the computer is authorized to an email address for the account of one of the Nooks that will not connect. Of the two Nooks for which the account has a different email address, one shows up in ADE but the other does not. As a result of this problem, we can only transfer books checked out of the library to one of our family's three Nooks.