Trackpad based "zoom" problem

Hi all,
Okay then, I am new to the buttonless MBP, and I have a habit of resting my thumb on the trackpad while my index finger does its thing. For the most part, this is not an issue, however, I randomly cause the frontmost application (including the Finder) to zoom in or zoom out the contents of the window or desktop. This is NOT the screen zoom, this is strictly a zoom of the contents of whatever is frontmost.
(i.e., in Safari, the text zooms, in the desktop the Icons get larger, etc).
I have checked all available preferences in an effort to turn off this functionality, but have come up blank.
Any help?
Thanks,
Matt

Hi all,
This isn't the same thing as the universal access zoom. The UAZoom actually zooms the entire desktop and windows. This problem just zooms the contents of whatever is frontmost. That said, the zoom does NOT include the menu bar, window header, dock, etc... just the items.
Although I have seen the problem with a few different two-finger touches.. the best way (and fairly consistent) to reproduce the problem is as follows....
1) Index finger placed at 11 o-clock on the top of the TrackPad. Finger should feel the ridge at the top of the TP.
2) Thumb placed at 6 o-clock on the bottom of the TP. (Thumb is kind of laying on its side on the TP)
3) Keeping the index finger completely still, slowly swipe the thumb up the TP. If nothing happens, slide the thumb slowly back down again. The thumb travels only about 1 inch maximum.
I made a movie of the problem, you can find it at....
http://web.me.com/mabou2/Site/Zoom.html
The problem has a random nature to it, which you will see in the video. But usually once I hit the right feel on the trackpad, I can repeat the zoom in and out, as you will see in the video.
Thanks,
Matt

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