I download a book from the Public library, hook up my Kobo, move the book from ADE's Library to my Kobo - ALL AS PER INSTRUCTIONS - I wait to make sure I'm not interrupting any download in progress. Remove my Kobo. Wait to make sure it loads. The screen shows the book I downloaded as a black cover and when I open it, all I have is a blank page and the note that it is 99% read.
I'm pretty sure this is an ADE problem (I have always hated Adobe and my hate grows and grows anything I have anything to do with them)