Have you authorized the eReader with the same ID as your copy of ADE?
Under ADE2.0, menu~Help~Authorize Device
Under ADE1.7.20, in Library view, menu~Library~Authorize Device
Have you authorized the eReader with the same ID as your copy of ADE?
Under ADE2.0, menu~Help~Authorize Device
Under ADE1.7.20, in Library view, menu~Library~Authorize Device