Hi Maithe, when you submit a book and get an error message and then try to resubmit, you will get a message that the file is empty. You need to go back to the browse button and reselect the book. I know it's a pain, but it's an old bug. As for the reason you're having problems with submitting the book in the first place, are you using Kurzweil? Sometimes you need to open the book in Word and do a space, backspace, and save. I don't know why this helps, but it does. Kellie