I have exactly the same problem one year later. (version 1.8.1)
Did you find a solution since that time ?
I tried :
- Deleting the appdata/local/amazon folder
- Uninstalling all "kindle" keys in regedit
- Downloading and installing a fresh Kindle app file
Each time I have the same problem, when I restart the app I can't read the books I paid for.
I have to reenter my credentials, and on the amazon side it adds me "a Registered Kindle Reading App" for each time I enter them.
Finally all is Ok when I check problem into the app, very smart checks indeed...
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