Works for me here on my AT&T USA Note 2
But I must use this technique:
1 ) Hold Phone with left hand
2 ) With your right hand, hold it straight and vertical like a "karate chop" , keeping the lower edge of your right hand area between your palm and tip of little finger as straight as possible.
3) Place your right hand 1 inch to the left of the face of the Note 2
4) With a slow even uniform motion, sweep your right hand left to right across the front face of the phone. Be sure to start the sweeping motion in dead space left of the phone, and be sure when your right hand first contacts the front face glass on the left side, your hand makes broad multi contact with the entire front glass ( top to bottom )
5) within 1 second of the left to right hand sweep, you should hear a camera snap sound and the screen should blank for a second, and a message saying the screen was copied to the clipboard.