Alright so I have a macbook, and so does my girlfriend. When changing the desktop background, the selections "Fill screen, Stretch to fill screen, Tile, and Center" do different things on our computers. For example if she selects "Tile" it puts a large picture tiled as several little pictures. If I select tile it tiles it but at the original (large) resolution, it doesn't make it smaller. Is there anywhere to adjust these settings or is this abnormal?