Pen mode issues


I have issues regarding the pen mode view when I open several files in rhino. The model is not very complex, see first attached image.

But I get these black marks all over when I zoom in our out or change my view, see attached images. Does anyone know what the issue might be?

Hej Malin -

Please post both the 3dm model and the output of the Rhino SystemInfo command.

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I can’t post the model, the info is confidential. What am I looking for in the SystemInfo command