It may be that your server is experiencing a bug with session variables. First, try modifying the seccion.php page.
Look for the following line of code:
php:
<?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:
<?php
// WA eCart Redirect
if ($<your cart name>->redirStr != "") {
session_commit();
header("Location: ".$<your cart name>->redirStr);
}
?>
