What messages do I see after an export?
"Interior PDF saved: N pages. It is open in your file browser.", "N printable PDFs saved (US Letter and A4) in the Printable folder. It is open in your file browser." or "N page images saved in one zip, 300 DPI. It is open in your file browser." Page images take a moment for a long book: the window says "Drawing each page at 300 DPI takes a moment for a long book."