I have exactly the same issue and I tried I think everything I could find on this topic to no avail, including authorize with same AdobeID, deauthorize, authorize with Overdrive ID. I just don't know what else to do. Books show up in the overdrive app after download, but not ADE. Sample books from Adobe page that are downloaded directly are showing up in the ADE library and work fine. I have brand new Lenovo laptop with Windows 8.1 installed.
Anyone that could help?