Zoli:

I'm glad to see that you don't have a problem. Being German, you're just a perfectionist. (Being Dutch, I feel free to say so.)

So, what to do? The diagonal striping on your objects is "normal". A box (Kiste) has 1 or 2 sides with diagonal stripes. Turn your model by 90 degrees and you won't see them.

As far as rendering is concerned: The "new" plug-ins do not depend on your video card to render your images. It's software-only, and that means that every computer should give the same result.

Hans