On the login page there is an access restriction rule:
<?php
if (!WA_Auth_RulePasses("Administrators")){
WA_Auth_RestrictAccess("ssl/admin/users_LogIn.php");
}
?>
This rule will not allow you access to the logout page unless you are logged in as the admin. If you want the logout page to logout anyone regardless of how you are logged in then you should remove this code from the top of the logout page.