add to cart vs go to checkout page not working

We have chose the setting

Settings related to the display of individual product pages.
Add To Cart Action
MarketPress supports two "flows" for adding products to the shopping cart. After adding a product to their cart, two things can happen:
Stay on current product page

And the system still takes the site customer to the checkout page.

I was expecting the Buy Now button to change to Add To Cart button and for the customer to stay on the same page to keep shopping.

Please help....there is so much about Marketpress that does not work well. This is a basic setting you provide, not a wish list.

Mike