Every click will result in a 404-error:
Hi @RSMG,
I’m sorry to hear you’re running into this. I’m not sure what would cause that, but I’d be happy to log in and take a closer look if you wouldn’t mind sharing login credentials in a secure note. Thanks!
Oh do you think it is a server issue?
From the Dashboard > Pro a link looks like /?cs-launch=1&cs_route=headers but in the editor it is still /footers or /content. So I thought this is the error.
Hi @RSMG,
I see what you mean now. If you right click and try to open in a new tab, they will 404. But if you just click them the application routing will take you to the correct place. To resolve this, you will want to enable permalinks. If you have them disabled, you won’t see the application update the URL and it could be hard to follow where you are in the application. It’s also better for users browsing your site since the URLs will be more readable.
How embarrassing. I am sorry, you were right. Mea culpa! 
No problem! Glad you got it sorted out!