After an exhausting three days of reviewing threads here and elsewhere and reviewing videos at Youtube, I have not seen anything addressing this problem. Although I have flown phantom 2 vision for about a year, I recently upgraded to the Phantom 2 Vision Plus. After about 20 flights, I had a small botched landing resulting in a 5 foot fall upside down, props shut down within 3-5 seconds. I broke one prop, but I pitched the lot and installed a complete new set which were balanced prior to installation. Since the incident I noticed that when I YAW LEFT, the aircraft moves rearward 10 to 15 feet and loses some altitude (3-5 feet), once I stop inputting Yaw, it attempts to stabilize over the GPS Home. When I YAW RIGHT the aircraft moves forward 10-15 feet and slightly right (3-5) feet. I have not noted any altitude change. I suspect the IMU may have been dislocated slightly resulting in these problem. I have done an advanced IMU reset and tried the "paper under the opposite side" fix. However, if I am attempting to correct the Left Yaw problem, it has no effect on the Right Yaw issue and recalibrating for the Right Yaw problem recreates the Left Yaw Problem. Any suggestions would be deeply appreciated.