I just upgraded two sites to Drupal 6. They're on a testing server, not publicly visible. One went fine, the other one appears fine unless you try to browse it anonymously. Every page gives you an access denied error saying "You are not authorized to access this page. "
I checked the roles and tried checking "access content" for all roles, also unchecking it for all roles (including anonymous in both cases) but no improvement.
Any idea what would cause this?