With Chrome the slideshow doesn't show anything. The inspector displays following error:
TypeError: this.navChildren.findlast is not a function. The entire message is attached below.

With Firefox and Safari the slideshow works as expected.
Just now, this behavior can be reproduced with www.biomuehle.ch

 

This must be a local issue with your Chrome browser. I tested it with Chrome on three different devices and didn't encounter any errors. The slideshow works without any problems.

Thank you for the quick reply.
Reinstalling Chrome solved the issue.