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Sometimes, when I scroll a document (most often a PDF) using the two-finger method on my laptop's trackpad, after a while, the scroller starts jittering and jumping pages. At this point, the pinch zoom does not work as well. This gets very annoying as you can imagine. Any idea what may cause this?

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Have you checked to see if there are updates to your trackpad drivers or to your PDF reader? Could be a bug that has already been fixed. –  techturtle Feb 5 '13 at 1:20
more information on the laptop would be nice. For starters, model, and whether you're using the stock install or any changes you might have made. –  Journeyman Geek Feb 5 '13 at 1:41

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