Problem
After upgrading to or installing Mac OS X Lion, you notice that the mouse scrolls in the opposite or reverse way in which you are used to.
Solution
To change the setting for the Trackpad:
- Click the Apple icon in the top left.
- Click System Preferences.
- Click the TrackPad icon.
- Click the Scroll & Zoom tab.
- Uncheck the “Scroll direction: natural” option.
To change the setting for a Mouse:
- Click the Apple icon in the top left.
- Click System Preferences.
- Click the Mouse icon.
- Uncheck the option named “Move content in the direction of finger movement when scrolling or navigating”.