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why the default strokes appear like that in illustrator ??? NB : I don't apply any bruch
Try View > Preview on CPU (or the French equivalent).
This bug has come up many times of the years in relation to GPU performance. Unfortunately I've not seen a solution.
Sorry to hear about your experience. Doug is absolutely correct in his response. Additionally, I'd request updating your OS & GPU driver to the latest version. Hope it helps.
Could BRUSH be applied on a STROKE?Something must be selected from the brush panel.
From the Apperance panel, you can delete the pre-preferences or remove the Brush effect from the Brush panel.