I have an identical problem to what is being described here:
newbielink:http://forum.abantecart.com/index.php/topic,1365.msg5442.html#msg5442 [nonactive]
I've installed the FexEx extension and before I got it configured it would show up with an authentication error on the front end. Now that I have it correctly authenticating, it does not appear at all on the front end. I did originally have the country code set to USA instead of US, but fixing that did not make it appear. I have also cleared the cache on the server and my browser. Any help on this would be appreciated. I'm ready to launch the site but the shipping wont appear!
Thank you.