Searching through the U.S. ASRS database, it should be possible to get an idea of what is happening elsewhere. Those reports are anonymous, of course. For instance report number 1202628 says "B757-300 FO reports being given the zero fuel weight by the Captain when requesting the takeoff weight for V speed calculation. The aircraft does not rotate or lift off at the predicted speeds, but does takeoff and climb normally once the required speed is obtained."