I've been having a problem with my wired mouse. Ever since I installed Snow Leopard I have noticed the mouse making small jumping movements when I move it at a medium and slow speed I was using a G5 Laser mouse and found it would jump around when I was moving it diagonally. It would make little jumps here and there randomally as i moved it diagonally, but it didn't happen when I moved the mouse vertically or horizontally. I eventually got fed up and bought a Razer DeathAdder Mac Edition, but I still have the same problem. I thought it might be the mousepad, so I got a new one and it helped a little, but the mouse still jumps when I move it diagonally. It is tolerable for day to day tasks (although a little annoying) but when I am editing photos it can be really frustrating. I have tried removing the Razer software but that didn't work. I installed USB Overdrive and Steermouse, but neither fix the problem. These are not wireless mouses, both are wired, and have an advertised 1800DPI. Anyone have any ideas?? I don't seem to have a problem when I use them on my MacBook which is still running Leopard???