Welp, I have about exhausted my tiny brain on this one. Any help would be appreciated.

Using Zone Shipping in the simplest manner (Zone 1 = US, Zone 2 = INT.) with Zone 1 being FREE and Zone 2 being controlled by how many items (a flat rate is applied per item).

Here is the kicker...
With one product in the cart I get this:


And with 2 I get this:


This happens for US and International Shipping. Now, in the first instance (only 1 item in cart) if you were to update the cart to include another product and continue, it is perfect. You can even go back and delete the second item (leaving only one) and it will be display the proper shipping.

I guess my question is, when does Zen Cart return the "(The shipping rate cannot be determined at this time): $0.00" message?? What triggers this message?

My brain is puddy at this point and I have failed.
Thanks to all for any help.
Regards,
Mike