Hi, I just bought the latest macbook pro. It is actually my first mac so I'm not really sure if this is supposed to happen. But I tried plugging in my "ordinary pc" (meant to say that is not a Mac mouse) mouse which is an A4Tech brand. It's working when I move the mouse in huge spaces. It goes smoothly that way. But when I try to move it in small little spaces, it's kind of like not going smoothly. Especially when I'm working on small details like Photoshop, it's kind of difficult to maneuver the mouse arrow. I tried other "pc" mouse as well but it's just the same.. Does this really happen if I'm not using Mac's mouse? How do I fix this? Thanks!