Trouble with start menu/loading screen script

So, I tried to add a start menu and a loading screen to my game (both are their own scene), but for some reason these scripts work perfectly fine in the editor, however whenever I make a build it screws up the game (it appears it initializes the game once per frame since it makes the camera jerk back and forth and I can't do anything that doesn't get immediately reset) When I make a build without the start menu and loading screen scenes it works fine. I'm going to start searching around the interwebs more in-depth but I figured I'd post this here first.

Here is the code that I have for the start menu (I believe the problem occurs in the loading code however):

 var logo : Texture;
 var background : Texture;
 
 function OnGUI(){
 
   GUI.DrawTexture(Rect(0,0,Screen.width, Screen.height), background, ScaleMode.StretchToFill, true, 0);
   GUI.DrawTexture(Rect((Screen.width/3),(Screen.height/3),(Screen.width/3),(Screen.height/3)), logo, ScaleMode.StretchToFill,true,0);
   
   if (GUI.Button(Rect((Screen.width/6)*2.3, (Screen.height / 8) * 7, Screen.width / 6, Screen.height/8),"Start")){
   
     Application.LoadLevel("Loading");  
   }
 }

And then here is the loading code:

 var background : Texture;
 var loaded : boolean = false;
 var startGame : boolean = false;
 
 
 function OnGUI(){
   Debug.Log("Helloooooo");
   GUI.DrawTexture(Rect(0,0,Screen.width, Screen.height), background, ScaleMode.StretchToFill, true, 0);
   Loaded();
 
   if (loaded == true){
   
     Debug.Log("loading done");
     if (GUI.Button(Rect((Screen.width/6)*2.3, (Screen.height / 8) * 7, Screen.width / 6, Screen.height/8),"Done Loading, click here to continue")){
   
       startGame = true;      
   }      
   }
 }
 
 function Loaded(){
  
  var isDone : boolean = false; 
  var async : AsyncOperation = Application.LoadLevelAsync("may1st");
  var textures : Object[] = Resources.LoadAll("Textures", Texture2D);
  var objects : Object[] = Resources.LoadAll("Objects",GameObject);
 
  yield async;
 }

Any tips or help is very much appreciated! Thanks! (: