Adobe Editions 3.0

Have used for over 5 years.  Suddenly when I try to download a book from public library it tells me digital editions is not responding.  When I go to my Kobo book is there but when I try to open it Message comes up  "Oops!  This document couldn't be opened. document is protected by Adobe Digital Rights Management (DRMK) and is not currently authorized for use with your adobe ID.  Please sign in with the authorized adobe ID and try again.