Today when I tried to draw a circle using a coin as a stencil I noticed that the circle was actually an oval (see picture below). I think it has something to do with Wacom aspect ratio configuration, but I can't find anything useful. Can someone please advise.
I have a Wacom Intuos4 6x9 tablet. Computer monitor is an old 4:3 CRT model. Operating system is Ubuntu 10.11.