Originally Posted by one_user
When I installed 2.4, all my sideloaded epubs (DRM-free) did not open. I got the same message "This document is not currently authorized for use with your Adobe ID. Please sign in and try again".
I had a similar problem after installing 2.4.0. Interestingly, it happened with only one of about 80 gutenberg.org books (all of course DRM free). I deleted this book several times via the menu, and copied it anew to the device, but was not allowed to open it. Now I can again open the book, but I don't know which of the things I have done in between was decisive.