Quote Originally Posted by stellarweb View Post
This customer does design too... so very hands on with the site. I will suggest it to her.

In the meantime, when I look at the code on the site I see this <div id="messages-bill"></div> which looks like it would show up right above the update button.

Unfortunately I cant find it anywhere in the files except for two .css files. Can you tell me where I can find that for the guest page? And would it show up ONLY on the guest page where they enter the address and then click the button?

Thanks!
Those divs (one for the billing- and one for the shipping-address) are where OPC's AJAX processing (via /includes/modules/pages/checkout_one/jquery.checkout_one.js, and its minimized version) display any error messages associated with an address-entry, e.g. a street-address that isn't supplied.

The messages show up whether guest- or account-checkout, if an address-related error occurs.