Digital Editions

My library uses Adobe Digital Editions to download digital books to my computer.  I then download from Digital Editions to my Nook e-reader.  Suddenly, I am unable to download books from my library loan page to ADE.  I have used this method for years without a problem.  The ADE page appears but there is nothing (no books) that are on it.  2 libraries where I have cards have tried to solve this problem.  I also took it to a technician who was unable to resolve.  He removed all cookies and said there were no firewalls standing in the way.  What to do now?