[AlexBell]

Originally Posted by cybmole

the file is actually called books.db. I typed notes.db by mistake.
yes it is there & fully working now. it seems to be there to hold notes, highlights, bookmark, which are stored as pointers to locations within books.

I have no idea how /if that syncs to reader software.

I can make notes in all books now, including the original problem book, after editing out the problem code from that

Thanks for your help. I have the same problem with my T2 and T3, so I'll remove the books.db file from the T2 first and see if that works.