Hello, I have added the plug and created a page with the shortcode to the sample page. I have also added a widget with the sample page hours and location, etc.
Using various themes, nothing shows up - it's completely blank, so it's not a theme issue. There are no other plugins activated/installed.
The "test" url is: http://188.8.131.52/~vasilios/kyrdinos.com/online-menu/