Hi,
Thank you for the details, it helps me a lot.
I looked through the front-end as well as the back-end options, those seem to be set correctly. The plugin is active on the front-end, I see the scripts and the stylesheet files loaded properly. I have looked through the theme functions file for a custom code, that may affect shortcode execution, but I could not find anything related. I suspect, that a 3rd party plugin, or a custom code within a different file is completely de-registering/replacing the plugin shortcodes. There is also a possibility of a bug that I am not yet aware of, but there should be an error message of some sort. Instead, the shortcode is actually executed, but nothing is on the output.
Can you please add temporary FTP details as well? I would like to debug through the plugin shortcode handler, to see if this is a bug, or something else.
Thank you!