I tried to convert The Works of Edgar Allan Poe from Google. I launched from the context menu and accepted all the defaults when prompted. It was unable to generate a preview page - I checked the path Paint was complaining about and there was no preview.png file there. I tried to preview another page with the same results. It went through and cropped all 349 pages fine, but when it started the next step (processing?) it only made it to page 2.
If you've any suggestions or would like the file, let me know - looking forward to seeing the results!