- From the OS X Finder, hit Command+Shift+G to bring up “Go To Folder”
- Enter the following path: ~/Library/Preferences/ and choose Go
- Locate the following files manually, or use the Search box in the upper right corner and narrow down for ‘driver’ to find them ? remove the ones that are relevant to your issue:
com.apple.driver.AppleBluetoothMultitouch.trackpad.plist - Magic Trackpad
com.apple.driver.AppleBluetoothMultitouch.mouse.plist - Magic Mouse
com.apple.driver.AppleHIDMouse.plist - wired USB mouse
- Drag the appropriate files* to the desktop to make a backup of them, or just delete the files* if you’re comfortable with that
- Leave the user Preferences folder and reboot the Mac
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