Adobe suddenly won't authorize my ebook

I have downloaded library books to ADE then to my KOBO for years.  Now when I try to open them in my ereader, it says I don't have authorization.  I de-authorized my e-reader with ADE then re-authorized it.  Now it says to re-import the book.  I did, and it still says that. No one seems to help.  I have tried KOBO and Adobe to no avail. It has been almost a week and I am getting really frustrated.  Does anyone know how to fix this?