lars petter wrote:
> [...]
> 
> if i try to scale it in x- or z- direction, the object simply fails to show
> in the render. scaling i y-direction however, works fine.

You seem to have a wrong idea what 'scale' does.  What you probably want is:

difference {
   cylinder { <0,0,0>, <0,1,0>, 1 }
   cylinder { <0,0,0>, <0,1,0>, 0.9 }
   scale <2,1,1>
   translate <5,0,5>
}

Christoph

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