Just resolved the "NON EXISTING" problem. The NON-Availability will show up if the product combination doesnt exist in the combinations area of prestashop. FOR EXAMPLE: if on the front end of Prestashop, the product shows a "size", "colour" and "material" check down box with each selection making up a combination of size -> "regular" colour -> "blue" material -> "silk" Then: in the combinations section the attributes making up the combination for the product must have a combination of size -> "regular" colour -> "blue" material -> "silk" The product must exist with this combination otherwise "Non Availability." Thanks Prestashop team.... the system is a great piece of art! Now the photos change on combination selection beautifully!