[Plugin: eShop] Will not go to checkout!

Can you replicate the problem using the Twenty Eleven theme with all other plugins deactivated?

The problem still exists using twentyeleven and all plugins deactivated.

Check the special pages section of the settings page.

and read this:
https://quirm.net/wiki/eshop/setting-up-using-eshop/configuration/special-pages/

Are you suggesting that the checkout page is missing?

In the special pages section, the checkout page ID is 212.

But I can’t find a page with that ID in the list of pages.

Should I create this page?

If so, how?

same as any other page, but read the wiki page for what you need to include.

I have added a new checkout page, inserted the shortcode and updated the Special Pages section and everything is now OK.

Many thanks for all your help.

good to hear that fixed it for you.