Hello Tom,
Below is an excerpt from the response from author of the “WC Vendors” Plugin when I reported the problem:
“It (generatepress theme) has the woocommerce.php file, which is a catch all, and does not allow any hooking or customization of the archive-product templates.
You can continue to use the theme, you just have to get rid of the woocommerce.php file and then template it out.
You may have had no problems with other plugins, but any plugin that hooks into the WooCommerce shop loop will not work with that theme. And that’s especially what you are using WC Vendors for, to hook into the shops.”
Regards,
Stardrive