Dunno what happened but nothing happens when I go to Window->Shadows. All other dialogs seem to work fine.

Also I used the scale tool on the solid floor. When I change the width in relation to the car it's fine but if I lengthen the road the car falls through.

Basic Car.skp

Can't figure out why but when I make a basic car it bounces down the road. I know everything is centered correctly. I even copied a wheel and motor to the side and connected the motor to the solid plane so that I could see the wheel spin in one place.