I'm awfully confused. I've enabled the USPS shipping module and it works great. I'm several orders in but am just now discovering that it's not working for international orders. With a test account I get the "Estimate Shipping Costs" pop-up but there's nothing listed under the table header.

When I go to checkout I get this message and can't go any further:
"We are unable to find a USPS shipping quote suitable for your mailing address and the shipping methods we typically use.
If you prefer to use USPS as your shipping method, please contact us for assistance."

Is there something else I have to do to make the USPS module calculate int'l orders? Here's my info below.

Thank you in advance!

* ZC v1.5.0
* USPS is the only shipping module enabled.

module settings:

Enable USPS Shipping
True

Enter the USPS Web Tools User ID
XXXXXXXXXXXX

Which server to use
production

Handling Fee


Handling Per Order or Per Box
Order

Tax Class
--none--

Tax Basis
Shipping

Shipping Zone
--none--

Sort Order
0

All Packages are Machinable
False

USPS Options
Display weight, Display transit time

Domestic Shipping Methods
EXPRESS, PRIORITY, FIRST CLASS

International Shipping Methods
Priority Mail International

Debug Mode
Off