Appointments+ | Shopping cart page doesn't open

Hello,

I've just updated the Appointments+ and MarketPress plugins on my site, but now if I click to reserve an appointment on the app_monthly_schedule, it doesn't go to my shopping cart page anymore.

Is there some kind of setting I missed?
This is my shopping cart pre-update; http://puu.sh/kpUXf/93263ff25b.png

Thanks