Bookworm_Girl, Thank you, thank you so very much. The thread you sent me to address my problem exactly and the solution deleting specific folders before reinstalling Reader Library worked.
When I set up the new MB Pro I changed the name of the Primary User Account from what it was on the old MB Pro and that's caused me problems with a couple of programs, including Reader Library app for my PRS505. My backup was current and fine. Hope you ran your Time Machine backup this afternoon
Aloha, Bob