People in the body of the tank don't get hit by bullets/explosions otherwise it's not much of a tank.
People should be able to get hurt in the body.
Changed it to the default setting (headphone, instead of surround sound) and still nothing.
Also, as far as your 'fix' goes for 'infinite lag', it can be used to go through ceilings.
That's due to the auto adjusting view distance.You can also turn that off.
Ghost brick disappeared and: