I can't get ADE to recognize my Nook HD

I have been using ADE for years without problems.  Now it won't recognize my Nook HD.  I have uninstalled and reinstalled the program, deauthorized and authorized the computer.  Still no talking between the two devices.  I talked with 2 people in chat and they told me the experts were over here.  I would really like to get this up and going again.