Custom redirect to "thank you" page doesn't work

When I fill the form, out of the sudden the redirect to my custom link does not work anymore. I just get a blank page:

My form:

https://www.jotformeu.com/form/61931347292357?preview=true

should redirect to:

http://www.baseline-media.de/design/vip-kunden/danke/

but just shows blank page on:

https://submit.jotformeu.com/submit/61931347292357/

I already cleared the cache, I don't know what I changed, because just minutes ago it worked just fine for hours!

Apologies, we had a brief issue with EU based forms that should now be fixed.  If you have any further trouble with your forms not submitting, let us know and we will be happy to have another look.