I have a KOBO ereader and downloaded a PDF ebook from the library and all went well the first time. I can't download any other books from ADE, ADE will no longer recognize the ebook when connected. When I transfer the ebook through my computer the book is locked on the ereader and tells me to initialize my ereader through ADE?? How do I get ADE to re-recognize my ereader? Can I re=register my ereader on ADE?