Can't add coupon in MarketPress

I just activated the MarketPress plugin. When I go to Store Settings and Coupons, I see a heading that says 'Add a Coupon' but there's absolutely nothing underneath (see attachment). I assume that there is supposed to be an area underneath where you can add a coupon but nothing appears.

I have MarketPress 2.6.2 and Wordpress 3.4.1. I'm not using BuddyPress nor is this a multi-site blog.