After I upgraded from version 6.2.3 to 6.3.1 I enabled Ajax and the logout, login and register pages do not work. I get 404 (Page Not Found) errors when trying to log out. This is the logout link I get on the logout button: "http://my-domain.com/logout/?_wpnonce=4e4b90c6b4"
Register also does not work. Before the register link was: (http://my-domain.com/login/?action=register) which does not work now. And also the new registration link: (http://my-domain.com/register/) gives a 404 page.