[Plugin: WP Marketplace – WordPress Shopping Cart System] Product pages do not display

I am trying this plugin out, added a few products, and to test paypal integration I assume I need to start with a product.

Whenever I try to get a product page to display from the links on the marketplace (or on the product edit page) I get a 404 error

Tried with the option to “Auto generate product page contents ” both set and unset, no difference.

WordPress does know something about the page – it shows up in the list of suggested results, but clicking that gets the 404 error again.

Is there something basic I am missing??

https://www.ads-software.com/extend/plugins/wpmarketplace/