SUPEE-8788 and PRODUCT QUANTITY NOT UPDATING (SOLUTION INSIDE)

[onlinestore23]

Well those on 1.7.0.2, after installing patch you may experience issues wiht changing quantities in "/checkout/cart/"
Say, you change quantity from 2 to 5 and click Update Shopping Cart... and NOTHING HAPPENS!

SOLUTION:
Go to : /app/design/frontend/yourthemepackage/default/template/checkout/cart.phtml

Find this line: getUrl('checkout/cart/updatePost') ?>" method="post"
and, under this line insert the form key: 

<?php echo $this->getBlockHtml('formkey'); ?>

DONE! 

[Gabriel Guarino]

Thanks for sharing!