Roll a Ball Build failed

The tags in unity update only after restarting the editor.

So to fix the problem save the scene, close unity, then open it back up and build again.

I have the same problem.

The game works in development but the build version does not react to collisions and ball rolls through cubes.

Win 7 32 bit. Unity 550f

Another curious thing - the date on the exe is always 24 Nov even though it was created on 22 Dec, Deleting it results in a new exe file with the same date.

Code:

using UnityEngine;

using UnityEngine.UI;

public class PlayerController : MonoBehaviour {

 public float speed;
 public Text countText;
 public Text winText;

 private Rigidbody rb;
 private int count;

 void Start()
 {
     rb = GetComponent<Rigidbody>();
     winText.text = "";
     count = 0;
     SetCountText();
 }

 void FixedUpdate()
 {
     float moveHorizontal = Input.GetAxis("Horizontal");
     float moveVertical = Input.GetAxis("Vertical");

     Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);

     rb.AddForce(movement * speed);
 }

 void OnTriggerEnter(Collider other)
 {
     if (other.gameObject.CompareTag("Pickup"))
     {
         other.gameObject.SetActive(false);
         count = count + 1;
         SetCountText();
         if (count>=8)
         {
             winText.text="You win!";
         }
     }
 }

 void SetCountText()
 {
     countText.text = "Count: " + count.ToString();
 }

}