I have recently inherited a site. The site was also recently moved and zen cart was reinstalled by a developer at the web hosting company we are using; I believe it was working properly before it was moved and reinstalled.
The problem is this: we currently have one product, and we need to apply a 2% handling fee to that one product. I have created the attribute and attached it to the product. If you look at the product page, you can see the attribute at the bottom of the page (although the radio button is missing):
http://www.tarheeltour.com/cart/inde...products_id=73
However, when you add it to cart, the attribute is not being added in. The "default attribute marked as selected" is "yes"
Here is the main store page:
http://www.tarheeltour.com/cart/inde...age=page&id=10
The situation is somewhat critical, as we're losing $45 on every sale right now.



