Hi Curt,
Thanks for reaching out to us! I would be happy to help you.
Well, it seems the shortcode you are using, [ecs-list-events], actually comes from The Events Calendar Shortcode, a plugin which is not developed by or affiliated with our company.
If you have The Events Calendar Shortcode plugin installed and activated, and if it doesn’t work properly, I would recommend you to contact their support.
For more information about the shortcodes available with Events Calendar PRO, please refer to this article in our Knowledgebase.
If you have any further questions, please don’t hesitate to contact me.
Best,
Jeremy