switching scenes by loadlevel, back to previous scene I got a problem

this is my test video link text

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Hello~ I test loadlevel command.

I have two scene:

1>Unity-chan SecondaryAnimation

2>I wrote a scene -runGame

flow chart: SecondaryAnimation -by Click btn->runGame-game over->SecondaryAnimation

first switch SecondaryAnimation -->runGame

I change scene at video 18 sec.

runGame works perfectly.

second switch runGame-->SecondaryAnimation I change again in 35 sec. In video you can see SecondaryAnimation not work... only Click button can do loadlevel, but scene is not work successfully.

what should I do?

I use Unity 4.3 .

Thank you very much

↓ is part of code ↓

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GameController.cs for runGame

 using UnityEngine;
 using System.Collections;
 
 public class GameControlScript : MonoBehaviour {
     float timeRemaining = 10;   //Pre-earned time
     float timeExtension = 3f;   //time to extend by on collecting powerup
     float timeDeduction = 2f;   //time to reduce, on collecting the snag
     float totalTimeElapsed = 0;   
     public float score=0f;      //total score
     public bool isGameOver = false;  
     public GUISkin skin;
 
     // Use this for initialization
     void Start () {
         Time.timeScale = 1;
     }
     
     // Update is called once per frame
     void Update () {
         if(isGameOver)
         {
             return;
         }
 
         totalTimeElapsed += Time.deltaTime;
         score = totalTimeElapsed*100;
         timeRemaining -= Time.deltaTime;
         if(timeRemaining <= 0)
         {
             isGameOver=true;
         }
     }
 
     void OnGUI()
     {
         GUI.skin=skin;
         if(!isGameOver)
         {
             GUI.Label(new Rect(10,10,Screen.width/3, Screen.height/3),"Time Life: " + ((int)timeRemaining).ToString());
             GUI.Label(new Rect(Screen.width-(Screen.width/3), 10, Screen.width/3, Screen.height/3), "Score: "+((int)score).ToString());
             //PlayerPrefs.SetString("score",""+(int)score);
         }
         else
         {
             Time.timeScale=0;
             //set the timescale to zero so as to stop the game
             //display the final score
             GUI.Box(new Rect((Screen.width/4)-20, Screen.height/5, Screen.width/2, Screen.height/2), "GAME OVER\nYour Score: "+(int)score);
 
             if(GUI.Button(new Rect(Screen.width/4+10, Screen.height/4+3*Screen.height/10+10, Screen.width/2-20, Screen.height/10),"Exit Game"))
             {
 
                 //Debug.Log("****************"+PlayerPrefs.GetString("score")+"*********************");
                 //Destroy(GameObject.Find("runroot"));
                 //Application.LoadLevel(0);
                 Application.LoadLevel ("SecondaryAnimation");
             }
 
         }
     }
 
     public void DonutCollected()
     {
         timeRemaining += timeExtension;   //add time to the time remaining
     }
     
     public void OnionCollected()
     {
         timeRemaining -= timeDeduction;   // deduct time
     }
 }
 

CameraController.cs from Unity-chan's MainCamera

 void OnGUI()
         {
             if(showInstWindow){
                 GUI.Box(new Rect(Screen.width -210, Screen.height - 100, 200, 90), "Camera Operations");
                 GUI.Label(new Rect(Screen.width -200, Screen.height - 80, 200, 30),"RMB / Alt+LMB: Tumble");
                 GUI.Label(new Rect(Screen.width -200, Screen.height - 60, 200, 30),"MMB / Alt+Cmd+LMB: Track");
                 GUI.Label(new Rect(Screen.width -200, Screen.height - 40, 200, 30),"Wheel / 2 Fingers Swipe: Dolly");
             }
             if (Application.loadedLevelName.Equals ("SecondaryAnimation")) {
                                 if (GUI.Button (new Rect (Screen.width / 2, 70, 100, 30), "Click"))
                     Application.LoadLevel ("runGame");
                         } 
             else {
                 if (GUI.Button (new Rect (Screen.width / 2, 70, 100, 30), "Click"))
                     Application.LoadLevel ("SecondaryAnimation");
                         }
 
         }