I am having the same issue at https://wp.skydive-ostsee.de/ausbildung/
The tag is [ecs-list-events cat=’theoriekurs’ limit=’4′ contentorder=’date’] and the category in events calendar is named “theoriekurs”
WordPress Version 4.4
The Events Calendar Version 4.0.4
Shortcode Plugin Version 1.0.11
Any hints?
