[Plugin: WP E-Commerce Shipping (Country, cart amounts)] Shipping amount showing up as $0.00 in cart

Not sure why, but I can’t get this to work at all. I have it as the only shipping option checked in the admin, but every time I add something to the cart, it just gives me $0.00 as the shipping total.

I’m including screenshots:
http://gyazo.com/c40ab2d62777d21fe5a136bae53dc5f4.png

Have I done something wrong with my rate table?
http://gyazo.com/2a4202613e0099849c300a95cf57dd59.png

Please let me know if you’ve got any ideas.

http://wordpress.org/extend/plugins/wp-e-commerce-country-cart-amount-shipping-module/