[Jon]

For users of 4.0.13 there's an update needed for ezUpsell.

The cart.php code is different.

Open cart.php

Find:

#
# Redirect
#
if($mode=="add" and $productid) {
     if(!empty($active_modules['SnS_connector'])) {
          func_generate_sns_action("AddToCart", $productid);
     }
     if($config["General"]["redirect_to_cart"]=="Y") {
          func_header_location("cart.php");
     } else{
          if(!empty($HTTP_REFERER)) {
               func_header_location($HTTP_REFERER);
          } else {
               func_header_location("home.php?cat=$cat&page=$page");
          }
     }
} elseif (!empty($is_sns_action)) {

REPLACE with:

#
# Redirect
#
if($mode=="add" and $productid) {
     if(!empty($active_modules['SnS_connector'])) {
          func_generate_sns_action("AddToCart", $productid);
     }
     #if($config["General"]["redirect_to_cart"]=="Y") {
     #     func_header_location("cart.php");
     #} else{
     #     if(!empty($HTTP_REFERER)) {
     #          func_header_location($HTTP_REFERER);
     #     } else {
     #          func_header_location("home.php?cat=$cat&page=$page");
     #     }
     #}
     if($mode=="add" and $productid) {
          func_header_location("added.php?cat=$cat&productid=$productid&amount=$amount");
     }
} elseif (!empty($is_sns_action)) {