Appointments+ / MarketPress not showing 'Add to cart'

Hi, I'm having issues with the MarketPress / A+ combination. My intention is for users to be able to select multiple appointments via 'add to cart'.
On the following page the 'add to cart' button is visible temporarily as the page is loading:
I have changed the theme to the default to ensure this isn't the issue. This is the shortcode structure I am using:
[app_pagination step="2" month="1"]
Before I start deactivating plugins across the network to see if any are conflicting, have I missed anything with the set up?