Among other Macs, I have a 2006 Mac Pro Dual 3.0. On this computer, any and all iterations of 10.6, even the install disk, exhibit peculiar and unwanted mouse behavior. For instance, I might be moving the cursor across the screen, and it will pause for the tiniest fraction of a second, and then leap to a point that is much further than it would have been if it had just kept moving at its current velocity. Anyone seen anything like this?