I haven't made any changes to zen car 1.3.7 - but now international addresses no longer allow you to continue to the purchase. They get this message when trying to use an international address (one not in the US).
United States Postal Service
An error occurred with the USPS shipping calculations.
If you prefer to use USPS as your shipping method, please contact the store owner.
I've removed, installed and reconfigured the module and getting the same error trying to use an address outside of the US.
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