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Since I prefer an open environment, I created a sky cube and removed the walls and roof of the hollow block -> does not work anymore.

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The lesson learned is that physics does not work in my skycube entity, which is ok, since I can work around that. Btw, this is not mentioned in the manual either, would be a great addition to the FAQ section since there may be other people as stupid as me.

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Try this: Do the same thing, but comment out any and all physics. You will see (or rather not see) that as you look up, your screen refresh will muck about and give you weird black patches and echos of the screen. This is because there is nothing "beyond" the skycube.

Just to be clear as to how this is already in the manual, the second you REMOVE the walls and roof of your skycube, it CEASES to be a skycube. And the second that you lose the skycube, all 3DGS hell breaks loose, not just the PE, but the Graphics Engine (GE) and Scripting Engine (SE) as well. This is a basic lesson that I think the manual does a good job at explaining already, yes/no?

So there is nothing wrong with physics and your skycube or any skycube for that matter. The second you cease to have a skycube, then Physics is but the first of the infinite problems you will have.

BUT, now that you have a skycube, you will find working with the PE will be equal parts fustration and joy! And don't forget to read this forum index at least five times. There is ALOT of good hard earned knowledge about using the PE inside, just ready to answer questions you have or didn't know you had!!!!
GL