Kobo told me to open ADE and then de-authorize the computer (on PC control+shift+d) and then reauthorize (you will be prompted). Then, with the Kobo plugged in to de-authorize the Kobo with ADE open (control+shift+e). Unplug the Kobo. Close ADE. Plug in the Kobo, open ADE, and authorize the device.
I did it, and initially seemed to work but then he problem reoccurred and had to do it again. Still waiting to hear from Kobo (wrote to them again yesterday) with another idea, but it may work for you.
In the meantime, syncing works and fixes the problem of unlocking the books--but who wants to sync every time we buy a new book? If you go this route, manually remove the locked version first.
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