Glad I'm not alone with the same issue. ADE 188.8.131.52 using Windows7
Did you had any chance to download the filesmanually toan ebook reader?
Search for files like %Bookname%.xml. They should be in a folder named manifest. At my Computer it is manifest\.external. Move the xml-files to another folder (or delete them for your own risk). Now there should be no books in the library because the xml files are moved to another folder. Then start digital edition and put the books again to the library.
Maybe there is more than one folder with %bookname%.xml-files