Hello Maik,
In an email reply I received, you mentioned that Step 4 in my example did not work for you, and you mentioned something about Liquid Layout. I do not see that in your reply above now—perhaps you have deleted it. In any case, I had not touched the Liquid Layout options, and am surprised to even learn about them. Yes, the default now seems to be "Controlled by Master" but the Master page default it set to Liquid Layout: Off.
Now, about Step 4:
I thought it would be easier to show in a video what I am tanking about. Here is my post on Vimeo: