MySQLi Log In User - not working on another domain now - Sessions being stored correctly. :(

The username and password are correct, but Restrict Access to Page is failing it every time. Link to page and FTP details provided below.
Please help as I've spent all day on this one behaviour and am going round the bend.

Thank you.
NJ

:(

I had set the action of the form to the success page URL because without doing that it appends all the querystring data to the URL once you arrive at the success page, despite this not being included in the URL of the $SuccessRedirect which is listed as this:
$SuccessRedirect = "smcadmin/smcadmin.php";

Why is the behaviour appending the querystring data from the former page, and how do I stop it doing that?

Thank you.
NJ

You can update the authentication.php page and change this line:

public function redirect($url,$noRedirect=false) {
    $this->Redirect = $this->addQuerystring($url);

to:

public function redirect($url,$noRedirect=false) {
    $this->Redirect = $url;