No Looping once preloader was added?

programming flash
1

So I have a looping SWF file that I uploaded on my website. It played perfectly until I decided to add a preloader.

I set up the Flash file with 2 Scenes, “Preloader” and “Scene 1” .The Preloader scene will play just fine. After the preloader plays, Scene 1 then begins to play as it should. However, once the animation ends, instead of looping like it did before, it just stops on the first frame.

How can I get my SWF to play the Preloader, and then continue looping the main animation (Scene 1)?
Here is my AS:

import flash.events.ProgressEvent;
  function update(e:ProgressEvent):void
  {
      var percent:Number = Math.floor( (e.bytesLoaded*100)/e.bytesTotal );
       if(preloaderMC is MovieClip){
           preloaderMC.gotoAndStop(percent);
       }
       if(percent == 100){
           play();
       }
  }
  loaderInfo.addEventListener(ProgressEvent.PROGRESS, update);
   
  // Extra test for IE
  var percent:Number = Math.floor( (this.loaderInfo.bytesLoaded*100)/this.loaderInfo.bytesTotal );
  if(percent == 100){
                  nextFrame();
  }
  stop();

I received a reply on another forum that said to do the following but I am not quite sure how to do this:

After loading is complete and you return to your first frame, your stop() is executing immediately after your nextFrame(). so flash won’t advance frames.

To remedy, use a boolean to determine if that frame has played once and if yes, don’t execute that stop(). Use a boolean to determine if that frame has played once and if yes, don’t execute that stop().
Any help is appreciated!