Can you please give more details about exactly what you have done, what you are trying to do, andhow it is that it fails?
I also haven't been able to borrow ebooks from my library for a couple of months now. I keep getting a message that I don't have permission to download the book to my device, a Nook. I can download it to ADE on my PC without any trouble. It asks for a username and password in order to proceed with the download to my Nook. It didn't used to do this.
@KPermie. Is it possible that the problems started with a 'upgrade' of ADE 1.7.x to ADE2.0.x?
There are lots of bugs in ADE2.0 (and 2.0.1). Try replacing ADE2.0 with the older but more reliable v1.7.2.
(You can have them both installed at once if you like.)
Version 1.7.2, it is a little difficult to find, available on Adobe site for Windows and for Mac.
The forum software is sometimes corrupting the link above. There shouldn't be a blank in 'editio ns.html'. The following redirects to the same page: http://tinyurl.com/diged172
Some people have found ADE trying to upgrade automatically.
It appears (not 100% sure) that if you install ADE2.0 as a new install (not as an upgrade) that your 1.7.2 will continue to run.
Probably best to say no if 2.0.x installation asks if you want to migrate your library.