I have the same problem. And the book is checked out according to my library account, but I cannot return it from ADE because it never actually finished fulfillment.
Also, another subject: what's with all these deleted/returned books showing up again in ADE all of a sudden?
I run Windows 10 on a PC and just installed ADE 4.5.4 today, after uninstalling ADE 3.0.
Sorry, this is not really an answer to the first post, just another person with a similar issue.