Edit: Some people are saying they are not seeing the plist. It might be worth noting that the /Users/your_username/Library (~/Library) folder is hidden by default in Lion. To unhide it, open Terminal.app and issue the command chflags nohidden ~/Library/ Not sure if that will help people find the plist that needs to be edited or not.

Edit #2: It is possible this is a Magic Trackpad only fix

Edit #3: This is a hack, don’t do it. Look here instead.

One of my biggest annoyances about OSX Lion is that it broke vertical (up/down) 3-finger swiping in most of my favorite apps including Carousel.

So being the diligent developer that I am, I wanted to figure out why and try to fix it for our users. Turns out the code doesn’t need to be touched for the fix…

First, open up System Prefs and go to Trackpad>More Gestures and make sure you are set up like this:

Now you want to open up ~/Library/Preferences/com.apple.driver.AppleBluetoothMultitouch.trackpad.plist in your favorite editor and make set the value of key TrackpadThreeFingerVertSwipeGesture to 1

Save the change you made to the plist and reboot (the system won’t pick up this change until you reboot).

Hard telling if this is a bug in the migration from Snow Leopard to Lion or if Apple left this out on purpose. But as of 10.7.0, this seems to work.

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