On the Newsletter Unsubscribe configuration page, click Preview online and jump to ‘?nm=unsubscribe&nk=0-0’. Normally, it should display an unsubscribe page, but now it jumps to my homepage.
Hi, check on the Newsletter Main Settings if the “Public Page” is correctly set to a WP page (it is usually generated on first installation). That page must contains only the [newsletter] shortcode.