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