Quote Originally Posted by ShopVille View Post
we are using zencart version 1.5.4 and OPC version is 1.4.1. Here is what i am getting in my one page checkout. First of all there is error "Sorry, but our expedited checkout process cannot be used. Click " and after clicking Confirm Order Its showing another error "Your order's details have changed. Please review the current values and re-submit."
The "Sorry but the expedited process cannot be used" message implies a javascript/jQuery error on the page. Since OPC is very jQuery-intensive, the message is intended to allow your customers to continue checkout if the store's configuration won't support that jQuery support.

What shipping, payment and order-total methods are you using?