There seems to be issues with the 4.15.1 release. First, when you click start on the Canyons map, the car falls through the map. Once I get the car back on the road by moving the whole scene to catch the car, the car does not move. It will play engine sounds, change gears, turn the wheels, wheels even accel, however, it does not move the vehicle. As for the garage map, as I seen from your videos, the car should be able to be tuned, however, it will go into drive mode and again, car does not move. Also, check Error Messages, there are things in there that need to be addressed. As it stands the 4.15 release is broken and unfinished (which is a no-no for marketplace content).