Please post your query in the Digital Editions community to seek for the right advice:
You can try deauthorizing (Control + Shift + D) and then reauthorizing your account (only if you know your ID and password).
Please check and let us know if this helps.
[topic moved to ADE forum]
did that a dozen times to no avail. Since I downloaded the 4.0 updated version, I am ubable to do anything with an epub file