BTW, I did try ADE 4.0 and 3.0.
The Button for return gray out?
That's correct, it's grayed out, and the library books that I import with the "Add to Library" function do not show up in the "Borrowed" category of ADE.
In this case contact you Library. I have the same problem before. In this case the eBooks (which has the issue) could not be returned. Ask you Library for it or ask if you can check your server.
Thanks for the input. Based on your suggestion, I tried downloading an EPUB book from a different library, and, sure enough, it worked just fine. It downloaded the .acsm file rather than the .epub file, and ADE used the .acsm file to download the book, putting it in the "Borrowed" category, where I could return it.
I have sent a message to the local library about the problem, but am not hopeful of a quick fix. They seem a little thin in technical staff.
You are welcome.
Well, I got the answer today from our local library.
The books I was downloading just happened to be "Open EPUB" books, meaning they have no DRM protection. I can keep them as long as I want.
An unintended consequence of these "loans" is that there is no way to return the books before their due date, so they sit on my library account, running up the number of books I have checked out. The librarian told me that if I really need to return them early so I can check out more books I could email a request to her and she can return them manually.