[rashkae]

I just had this problem with firware 2.1.5. I have not, and will not, test with 2.3.1.

I recently had to replace a bad epub with a newer copy. I first deleted the book in Kobo, then connected to PC and copied the new file. However, the Kobo would crash and restart every time I tried to open the book, and continued to do so no matter what I tried to fix it, including trying a completely different copy, and erasing my Kobo Database to start a new one.

The I realized that I had to give the book a new file name before Kobo would successfully open the book. Not satisfied with this workaround, I further found that the problem was a remaining annotation file in the Digital Editions/Annotations folder. That file had to be manually deleted before Kobo would let me use a different copy of the book (with the same filename.)

Edit: I should note that I do not understand the exact conditions required to replicate this problem. Replacing a book is something I've done several times before. This is the first time it just refused to work.