I don't see anything adding to the cart.
to start with, download the sessionTest.php file from the following thread and upload it to your server to if there host has session management configured properly:
showpost.php?p=23826&postcount=2
if the sessionTest.php test successfully, then find the following line in your add to cart pages:
<?php
// WA eCart Redirect
if ($<your cart name>->redirStr != "") {
header("Location: ".$<your cart name>->redirStr);
}
?>
where <your cart name> is the name of your cart object.
and change it to:
<?php
// WA eCart Redirect
if ($<your cart name>->redirStr != "") {
session_commit();
header("Location: ".$<your cart name>->redirStr);
}
?>