I think I have no more suggestions that will help.
One thing you can double-check, but I'm not sure how best to use the result of the check ....
- Find the internal Adobe ID (uuid) associated with your authorized account on ADE.
menu/Help/Authoization Information (ctrl-shift-I) will give both the email and also the internal ID that is the real key to an account. - look inside the book file as below, and you will find the internal ID (uuid) for which the book is authorized
see tedious mechanism below.
If the two match, there is something wrong with ADE and way you have performed registration of it.
If the two do NOT match, you have somehow got a confusion between your IDs.
ADE is correctly registered, but not to the ID you think.
1) ~~~~
OK. To find the internal AdobeID.
- open a sample DRM .epub file as a .zip file.
With some zip programs, you can just open the .epub as an archive (ev, with 7zip),
with others you will have to rename the .epub file to a .zip file first, then open it. - find the file 'rights.xml' within the zip. Probably 'META-INF\rights.xml'
- open the rights.xml file
- inside you will find a section '<user>' that looks something like
<user>urn:uuid:ff2ddc22-eca0-46c6-a84d-xxxxxxxxxxxx</user>
That string is the internal version for your AdobeID.
That stays fixed for the AdobeID, even if you change the associated email (or password),
that internal ID is what is really associated with the book.
(n.b. there is no point in trying to change the urn to a current one you might find and recreating the .epub file; the DRM is cleverer than that).