After most recent update, getting file not found error at random when trying to open books from library. Signed out, reloaded update & spent 4 hours downloading library again, still get the error although it shows as being downloaded. Don't you beta test these updates before pushing them out? Piece of junk, frustrating On hold for 10 hours three separate times for failure to download titles and sync libraries to 2 devices. Total failure & waste of time If i could give 0 stars I would.