Free Shipping for orders over $40 isn't working for me.

Hi. I have installed MarketPress and entered some coupon codes, but the Free Shipping settings that I've set up aren't working for me. I have it pre-set to automatically grant free shipping when orders exceed $40 but right now that feature isn't giving the automatic discount.

I have set "Table Rate Settings" where shipping is $5 in the US and $7 internationally for orders between .01 and $40 and Free for orders over $40. Is this the best way to offer Free Shipping on orders over $40 or is there a better method?

Thank you for your consideration of my question.