Pause Button Freezing Game

Hey Everyone! So I have a pause button that has other levels that I access from it, whenever i click those levels, It freezes the game! I have attached a video of an example how. It is in my FPS shooter so when I go back to gameplay, the character is frozen too! The Options Screen, Store 1, and loadedLevel are all freezing... This is the script I have been using:

 var isPaused : boolean = false;
 
 
 function Update()
 {
      if(Input.GetKeyDown("p") && !isPaused)
    {
       print("p");
       Time.timeScale = 0.0;
       isPaused = true;
    }
    else if(Input.GetKeyDown("p") && isPaused)
    {
       print("Unpaused");
       Time.timeScale = 1.0;
       isPaused = false;    
    } 
 }
 
 function OnGUI ()
 {
 
 
     if(isPaused)
     {
       // RenderSettings.fogDensity = 1;
       if(GUI.Button (Rect (500,120,160,40), "Upgrades")){
          Application.LoadLevel ("Store 1");
       }
       if(GUI.Button (Rect (500,160,160,40), "Main Menu"))
       {
          print("Main Menu");
          Application.LoadLevel("IDKStart");
          Time.timeScale = 1.0;
          isPaused = false;
       }
       if(GUI.Button (Rect (500,200,160,40), "Options")){
          Application.LoadLevel ("Options Screen");  
       }
       if (GUI.Button (Rect (500,240,160,40), "Restart")) {
  Application.LoadLevel (Application.loadedLevel);
 }
    } 
 
 
 }
 
 
 @script AddComponentMenu ("GUI/Pause GUI")

And this is the video: http://www.youtube.com/watch?v=prXnjkWHX9E&feature=plcp

Can someone help me figure out/fix the problem? Thanks!!