I went to your site and the registration and login seem to work. The issue seems to be that the index page has the wrong rule to restrict access to page. The rule should say to restrict access if they are not logged in to pcms2_users.
So the code should be:
<?php
if (!WA_Auth_RulePasses("Logged in to pcms2_users")){
WA_Auth_RestrictAccess("login.php");
}
?>
not:
<?php
if (!WA_Auth_RulePasses("Failed log in")){
WA_Auth_RestrictAccess("login.php");
}
?>