I’m sorry, it’s forbidden for me to add a comment to this post : https://siteorigin.com/thread/video-slideshow-siteorigin-goes-over-the-menu-bar-instead-of-behind/
But the problem seems to be the same.
My temporary URL is : http://ida2018.c2medias.com
Even the secondary menu (when the mouse is over the main menu) is hidden by the slideshow.
thanks for your help,