Car Tutorial Raycast Issue since Upgrade Unity 4, Build fails editor works

Hey Guys,

maybe someone has got the same issue since upgrading to U4. I am working with the car tut alternatephysics model and since upgrading to u4 the game works normal in editor mode but the build gives me the following error from the wheel script:

raycastclosestshape:max distance must be greater than zero. at line4: bool onGround...

I double checked it within the console (printed: hit.point, hit.distance, hit.collider, hit.normal, and the starting point of the ray) and the distance the raycast gets is always greater than zero to the next shape. I also put the wheel mesh out of raycast sight for a try...

I didnt change anything within the original CarTut Wheel script, so I dont really understand the problem.

Well I burned the whole last two days and I hope someones got an idea.

 void FixedUpdate () {
 
         Vector3 pos = transform.position;
         up = transform.up;
         RaycastHit hit;
         bool onGround = Physics.Raycast( pos, -up, out hit, suspensionTravel +radius );
         //print ("Distance:" + (suspensionTravel + radius));
         if (onGround && hit.collider.isTrigger)
         {
             onGround = false;
             float dist = suspensionTravel + radius;
             RaycastHit[] hits = Physics.RaycastAll( pos, -up, suspensionTravel +radius);
             foreach(RaycastHit test in hits)
             {
                 if (!test.collider.isTrigger && test.distance <= dist)
                 {
                     hit = test;
                     onGround = true;
                     dist = test.distance;
                     
                 }
             }
         }
 
         if (onGround)
         {
             groundNormal = transform.InverseTransformDirection (inverseLocalRotation * hit.normal);
             compression = 1.0f - ((hit.distance - radius) / suspensionTravel);
             //print ("Compression:" + (1.0f - ((hit.distance - radius) / suspensionTravel)));
             print ("HitPoint:" + (hit.point));
             print ("Position:" + (pos));
             print ("Distance:" + (hit.distance));
             print ("Collider:" + (hit.collider));
             print ("Normal:" + (hit.normal));
             wheelVelo = body.GetPointVelocity (pos);
             localVelo = transform.InverseTransformDirection (inverseLocalRotation * wheelVelo);
             suspensionForce = SuspensionForce ();
             roadForce = RoadForce ();
             body.AddForceAtPosition (suspensionForce + roadForce, pos);
         }
         else
         {
             compression = 0.0f;
             suspensionForce = Vector3.zero;
             roadForce = Vector3.zero;
             float totalInertia = inertia + drivetrainInertia;
             float driveAngularDelta = driveTorque * Time.deltaTime / totalInertia;
             float totalFrictionTorque = brakeFrictionTorque * brake + handbrakeFrictionTorque * handbrake + frictionTorque + driveFrictionTorque;
             float frictionAngularDelta = totalFrictionTorque * Time.deltaTime / totalInertia;
             angularVelocity += driveAngularDelta;
             if (Mathf.Abs(angularVelocity) > frictionAngularDelta)
                 angularVelocity -= frictionAngularDelta * Mathf.Sign(angularVelocity);
             else
                 angularVelocity = 0;
             slipRatio = 0;
             slipVelo = 0;
         }
         
         if (skid != null && Mathf.Abs(slipRatio) > 0.2)
             lastSkid = skid.AddSkidMark(hit.point, hit.normal, Mathf.Abs(slipRatio) - 0.2f,lastSkid);
         else
             lastSkid = -1;
             
         compression = Mathf.Clamp01 (compression);
         rotation += angularVelocity * Time.deltaTime;
         if (model != null)
         {
             model.transform.localPosition = Vector3.up * (compression - 1.0f) * suspensionTravel;
             model.transform.localRotation = Quaternion.Euler (Mathf.Rad2Deg * rotation, maxSteeringAngle * steering, 0);
         }
     }

Thanks ahead.