Creating a free coupon in Membership doesn't work.

My client created a coupon on her website which allows free access to one of her videos. The video costs $27, so the coupon is for $27 off. When I apply the coupon, it shows I will have access to this video for the period of "free for 1 year". When I click subscribe, it refreshes the page and removes the coupon, setting me up to pay $27 to see the video and still not adding the subscription to my account.

Below is a link to the subscription I am attempting to sign up for and apply the coupon. For obvious reasons I cannot put the coupon code on this ticket, but could email you offline so you can test on my website if necessary.
http://intuitivehandspt.com/register/?action=registeruser&subscription=1

Thank you!