On http://www.nivaagaard.dk I have a lot of top-sliders. They all work in all three languages on the page except the one called: "Ændrede åbningstider og begrænset … 35 og 36" (first slide). This one said "oops something went wrong" when going from english or swedish.
I have tried making new page, changing the slug etc. No luck. All the slides are done the same way.
Do you have any idea what it is that is teasing?