This one is pretty bad I think, though it's been there a while.
It wasn't obvious that Tux Paint was at fault until I tested
with the gimp. Maybe an event queue overflows.
Pick the fine-point brush. Move the mouse quickly in a circle,
trying to trace over your path. I see a decent curve for about
40 degrees of the circle, then a straight line cutting across
the circle for about 80 degrees. This repeats, giving me what
looks like triangles with chewed-off corners.
Quickly drawing a curly thing will also show it well.
The gimp does not suffer from this.
I already tried turning off sound. It didn't help.
I see this on two machines:
1. 450 Mhz Mac G4 Cube with a USB mouse
2. the OLPC XO-1, B4 hardware revision
In both cases I'm running at 1200x900.
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