Paypal And Authorize.net Not Creating Orders In Back Office

[FoodAssets]

Hi again,

Having problems with PayPal module. Using Prestashop Ver. 1.6.1.2 and PayPal USA/Canada module Ver. 1.3.9 (PayPal standard payments properly configured).

1) I am able to place an order via PayPal through my website successfully....
2)... but orders do not show up in Back Office. Nor do I receive a new order notification from PrestaShop through email (I do receive the notice from PayPal that I have received money.)

3) Upon completing PayPal payment, there is no order confirmation screen, nor does it redirect back to my website.

I am also having the exact same problem with the Authorize.net module (Authorize.net AIM Advanced Integration Method ver. 1.5.6) not creating orders in Back Office or sending notifications via email of a new order.

Ideas???