Thank you for answering so fast even on a sunday afternoon!
As far as I can see, there is an option in ithemes activated, that forces http to https. When I deactivate this, it the link to “EU-Cookie-Richtlinie” works. But they do not recommend to eactivate this option.
I will try to ask in the ithemes-support.
So again: Thank you very much! You earned a Ballon ??
