I’ve recently installed Corel Painter 11 trial version and tried to paint something. But for a short time I noticed for some lines being drawn, at the end the pencil sometimies goes down to draw a vertical line.
I tried ArtRage and mspaint, but the effect is only on Corel Painter, on any drawing tool except eraser.
The device I’m using is Wacom Intuos3, I previously used in Inkskape a lot with no such problems. Anyway, I’ve updated the Wacom drivers to the latest version; multiple system restart - no difference.
Here is a screenshot with a problem, note 4 vertical lines.

Do you know anything about this bug ? Please help to solve this problem.
