Originally Posted by PeterT
This sounds likes a corrupted database on the Kobo; only way to fix that is a factory reset and then reload books.
However before trying that have you verified that the time and date are correct on the Kobo?
As it happens, I was JUST discovering that it wasn't. At all. It was set to February 2010. Fixing that has got the current book working fine, and after restarting and re-syncing....
That fixed it. I wonder what reset the date?
Many thanks! I was desperately trying to figure out how to afford a replacement.....