did you add this code to your checkout success pages as suggested in previous responses to this sthread?
<?php
// Initialize the session.
// If you are using session_name("something"), don't forget it now!
@session_start();
// Unset all of the session variables.
$_SESSION = array();
// If it's desired to kill the session, also delete the session cookie.
// Note: This will destroy the session, and not just the session data!
if (ini_get("session.use_cookies")) {
$params = session_get_cookie_params();
@setcookie(session_name(), '', time() - 42000,
$params["path"], $params["domain"],
$params["secure"], $params["httponly"]
);
}
// Finally, destroy the session.
@session_destroy();
session_regenerate_id();
@session_start();
?>
the conform page is a read only cart, it will not allow you to change quantities.
If the user wants to change quantities before checking out, they need to go back to the main cart display page.


