[vtkusers] Flashing while using python?

[Bert VanSesamstraat]

Hi,
I've some problems when I'm using the python examples.
When I use the examples :


vtk-examples-4.1.1/Examples/Tutorial/Step1/Python/Cone.py
vtk-examples-4.1.1/Examples/Tutorial/Step2/Python/Cone2.py


I get twice a rotating cone and after rotating the renderwindow vanishes. 
Just like it is supposed to do (I think).

However when I'm trying some other python examples like:

vtk-examples-4.1.1/Testing/Graphics/Python/Cone.py

I get for a very short time a renderwindow where I can see a cone but after 
a fraction of a second it vanishes. This is not like it is supposed to do (I 
think).

Can anybody tekk me what I'm doing wrong?

p.s.
I run them as follows:

python "script-name"

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