We're using a custom theme with 2 widgets along with WPEC shopping cart (3.8.6).
Once a product is selected, fancy notification takes us to the checkout page. There, UPS and USPS shipping options are displayed. UPS has one of its costs selected as a default. When a USPS cost option is selected and the "Purchase" button is clicked, an error is thrown saying that we must select a shipping option. At that point all USPS option disappear leaving UPS as the sole choice.
Anyone experience this yet? Suggestions?