Okay, I am running OS 10.5, and one of my kids did something to the desktop that makes it look "jumpy". When moving the mouse, the screen moves also, since not everything fits on the screen any longer. To see the dock, you move the mouse down, but then the menu bar at the top disappears. It's almost like they did something to make the screen larger than the display, so not everything on the desktop can fit the display (iMac). Any ideas? Luckily, it is not my user account, but still, it is driving me nuts!!