Featured image - list view

Hi there,

I just started to use Events+ on my website (http://striketours.loudzap.com/) and I want to include the event's featured image on events archive list. The events have already a defined featured image but it doesn't appear on the list i've created with the shortcode. As I saw in the documentation, the images should appear automatically in the event's list but it's not happening. Can you help me please? The version I'm using is 1.9.4 .

Thank you