Fix Mavericks vertical scrolling lock? (jerky scrolling, accidental safari back) After installing Mavericks over Mountain Lion, my vertical scrolling is wiggly (jerky) on rMBP.

Similar as in iOS, when scrolling with two fingers on touchpad down or up, a smooth motion "locks" the scroll to vertical scroll only. After upgrading to Mavericks, vertical scroll does not "lock" and will also wiggle horizontally.

This makes scrolling in Chrome and Safari painful because browser will make go back or forward in history when trying to scroll. Occasionally the screen will also jump a few pixels up or down because it's recovering from the horizontal shift.

Any advice ?
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I made a quick app which hacks together some basic vertical-only scroll lock support. It basically tells the system to ignore small horizontal movements when scrolling in a mostly vertical direction.

You can download the app from http://kapeli.com/ScrollLock.zip. The source code of the app is available at https://github.com/Kapeli/Mavericks-Scroll-Lock.

I have no idea how well it works, only barely tested it, but it will prevent horizontal movement when your scroll