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I have a problem with three fingers drag gesture in OS X Lion on my Macbook Air 2011. This gesture can be turned on in trackpad preferences. I have no problems when my fingers are horizontally like in video instruction:

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But often I use laptop from the bed, and my fingers are vertically:

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In this position system often (but not always) doesn't recognize the gesture and act like two fingers gesture.

Is it common behavior, or bug in my laptop? Can it be fixed?

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Same issue here with MBP (2011) OS 10.7.1. – Jin Sep 25 '11 at 5:48
Your question pointed out the core thing here: your fingers should be oriented a certain way to get consistent three finger drag. Orientation is critical for it to work every time. – Brett Aug 26 '12 at 3:31

Try using only the top half of your trackpad when doing this.

The lowest finger might get interpreted as the "button finger" whose movements are ignored.

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