If I select the gallery to show as a slide show first on a page, nothing shows up at all on the page.
If I have the image gallery show up first - and then click switch to slideshow - the page goes blank.
I'm using the Mantra theme, Version 22.214.171.124
I did check the Plugin compatibility and everything came up with a green check.
I'm trying to get my slide show to look like your 3rd example 'Image List' on your gallery demo page. I also don't have the little 'next' show up on the right side of the picture in the main area. I only get 'click to close'. I can only go to the next picture from the very bottom of the slideshow.