Gallery does not show up

Hi,

I installed the free version of Robo Gallery, loaded some pictures into a new gallery, inserted the shortcode of the gallery into a page, but the gallery and the images respectively do not appear. Is there a conflict with the theme? (I am using catch evolution pro as a theme).

I would like to change from nextgen gallery to Robo Gallery. With nextgen, we had no problem displaying pictures at the front end.

Link to our website.

Any hints to resolve the problem?

Kind regards

Franz