I'm a new mac user and one of the things which has troubled me is the mouse. When having to do very precise clicks, such as pressing the upper right corner or right clicking on a word. That is, very precise short distanced moves with the mouse, the mouse seems to stutter. I have tried to change the mouse-sensitivity, and the change is noticeable, but only when dragging the cursor over larger distances. I still have the problem of stuttering over short distances. I tried asking my father to use my mouse, and he had the same problem. It seems to be a problem with the software since I have the same problem with my track pad and my external mouse.