Magento - Google Checkout Free Shipping Problem

I have set up Google Checkout on my Magento store and I'm using Flat Rates for the shipping. the problem is if I put zero for the rate ie. free shipping I get a message when I go to checkout saying that I don't ship to that country.

If I add any value into the rate (even 0.01) it works fine.

Here is a screen of the config which doesn't work: http://skitch.com/a1anm/dqmw2/configuration-system-magento-admin

Here is a screen of the config which does work: 开发者_StackOverflow中文版http://skitch.com/a1anm/dqmw9/configuration-system-magento-admin

Here is a screen of the error I get at checkout if I set the shipping rate to 0.00: http://skitch.com/a1anm/dqmim/secure-checkout-with-google

Any ideas why this isn't working?

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I believe (and I can't check, so I'm going off of memory here) that if the rate is set to 0.00, the Shipping module returns false and there are no available shipment methods. I think you'll have to create a cart discount rule in order to get it to return true and get you over to GC with free shipping.