I don't know if I am doing something wrong or set something up wrong, but at frequent random times while painting, blending, whatever I'm doing, a random line would go from where my pen is to the upper left of the screen, making a mark or even two. I would have to CTRL+Z about 3 times to get it to disappear and redo my strokes. This happens quite frequently to the point it's more than just annoying, it's almost unusable. I admit I did mess with the tablet pressure settings but then I ended up putting them back to what they were but that didn't help any.
The lines would always go to that upper left corner of the screen. Also I turned off all button features (set the buttons all to "none" for actions) and still it will make these random lines to the exact same spot on the screen. It looks like the lines are trying to go off screen.
I have a DigiPro WP5540 5" x 4" USB Graphics tablet, using Linux Mint 14 (KDE Version) and the xserver-xorg-input-wizardpen_0.7.3-0jaunty5_amd64.deb driver. I'm using MyPaint 1.0.0 (obtained from the Software Manager in Linux Mint).
Any way to stop this random line thing?