[Plugin: Portfolio Slideshow] Loading animation doesn′t show up

Hi, I′m using the great portfolio slideshow plugin on my website. But since I changed to the newest version of the plugin the loading gif doesn′t show up anymore. It′s this website here: https://www.ackermann-raff.de/w/

Has somebody an idea what′s the problem here?

Hannes

…I′m running the newest version of WP. And just a few other plugins.

https://www.ads-software.com/extend/plugins/portfolio-slideshow/