ADE authorization issues - none of the usual troubleshooting has worked

My ereaser worked just fine with ADE until about a week ago - I cannot open any library books I download on my ereader anymore.  I get the error message: your ereader is not authorized to open this book.  I have tried reathorizing the computer, the ereader, rebooting everything, deleting all the files associated with  the books on the computer and the reader, reinstalling the software, reinstalling lower version software, factory resetting the reader... nothing has worked.  Today, after deleting all the files, uninstalling the software, and factory resetting the reader, I reinstalled the software, reauthorized the computer, reauthorized the reader, and downloaded a brandnew book from the library... your ereader is not authorized to open this book.  Neither the kobo help, nor the adobe help could actually help.  They suggested I post here.  HELP???