Have been using Nook Simple Touch with ADE for couple years no problem. Upgraded to 4.0 and started having problems. Reverted back to 3.0, unauthorized and reauthorized and still cannot use. Cannot transfer library books, download them or return them. Disabled and very dependent on Nook. Really need help.
What is the exact error message you are getting?
"Error returning item. License server communication problem.
"The following items could not be copied to your device . . .
CE_COPY_NOT_ALLOWED - no permission to copy the book"