The $0 shipping was probably the default value you have in your GCO Admin module. It was probably displayed because the connection timed out - as indicated by the long rendering time. That's what the default value is for. I think you indicated in a previous post that you had a place to enter a default value for itemnational while editing the GCO module in admin. I think that the dropdown display not showing "USPS Media Mail" is for the same reason. On mine it pulls that label from the mc_shipping_methods_names = array.
The display of only itemnational is logical as the test account you used most likely has a US address. Offering international shipping would not make sense.
I wonder if your duplicate free shipping was because the names you used in the domestic portion and the international portion of the freeshipper array were the same? ie: the 'freeshipper' => entries.
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