Apple launched Mac OS X Lion last week and when it was launched, the way gestures worked was changed quite a bit. Scrolling up and down a page was reversed meaning that you now drag two fingers down to scroll up as though you are grabbing the page on the screen.
One of the gestures that broke was for the Google Chrome browser. Chrome used a 3 finger side swipe to flick between pages but as you’ll notice on the image below, Apple has made a default 3 finger side swipe to switch between apps. This caused this function in Chrome to break.