Users can't add course to cart and checkout

Recent updates to WP, Coursepress Pro, and Marketpress seem to have broken the checkout capabilities on my site. If I go to the course 1) there is no add to cart button and 2) if I click "Enroll" the screen greys out but nothing happens. I also notice the Enroll button is going to the student-login page.

Basically, there is no way for a student to put the course in the cart and check out.

Edit to add that I discovered that if someone registers on the site they then have access to the course without paying. Coursepress is marked "paid course" and the course is a product in MarketPress.

I have turned on support and would love for someone to take a look!