AS3 preloader problem on Mac

programming flash
1

I created an AS3 preloader that loads an external swf in to itself. Code here:

import caurina.transitions.Tweener;
var l:Loader = new Loader();
l.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, preLoop, false, 0, true);
l.contentLoaderInfo.addEventListener(Event.COMPLETE, done, false, 0, true);
l.load(new URLRequest("external.swf"));
 
var swf:Object = new Object();
 
function preLoop(e:ProgressEvent):void{
 var perc:Number = e.bytesLoaded / e.bytesTotal;
 percent.text = Math.ceil(perc*100).toString() + "%";
}
function done(e:Event):void{
 Tweener.addTween(loader_mc, 
      {alpha:0, 
       time:1, 
       transition:"easeOutCubic", 
       onComplete:startGlobe});
 removeChildAt(0);
 percent = null; 
 swf = e.target.content;
}
function startGlobe(){
 addChild(l);
 swf.beginAnimation();
}

Pretty simple. The problem is that on a Mac, the Event.COMPLETE function does not fire once the swf is finished loading. Anyone else run into this situation before?