a very strange problem has been bothering me for long time, since when I started to use this mac which is not mine.
Often, while I'm moving the mouse the cursor suddenly begin to move randomly. This happens with strange time intervals. Maybe it happens especially when I try to move a window dragging it from the title bar (or this is just my perception, do to the frustration of not succeeding in moving a window where I want it to be!).
- The first try was to change the mouse (a magic mouse) with another one (logitech). The problem persisted.
- Then I supposed the reason to be the keyboard's usb port used to connect the mouse, so I connected the mouse directly to the mac. Still the same problem was present.
- In the end I noticed an even stranger behavior: when the cursor starts to randomly and suddenly jump all around the monitor (for instance when I'm trying to drag a window around), if I go in mission control (by the mouse itself or by keyboard), the cursor returns to work properly.
This problem is very frustrating and, as already said, it presents very often, regardless of the mouse and of the usb port it's connected to. And this keeps me from buying one.