Chaining of eventListeners BUGS with Loader

Question

My goal is to load numerous images to be displayed in an AIR application. For this I use the following code. The counter counts the number of times each event is triggered. The problem is that loading 1024 images:
-  in the onLoadingComplete function the counter finishes at 1024... this is fine
-  in the onParsingComplete function the counter finishes at various numbers (412, 405, 380...) different at each run
- nothing goes wrong with less than around 500 images, all are loaded
My assumptions:
- 'complete' event not triggered if image content is the same (I am using 8 copies of 128 different images)
- loaders have a concurrency problem
- eventListeners asynchronous behavior is buggy
ANY IDEAS, FEEDBACK ? Should I file a bug ? (by the way I am using Flex 4 on a mac)
for each( var file: File in files ) {
     if ( ! file.isDirectory && file.extension == "jpeg" || file.extension == "jpg" || file.extension == "png" ) {
     var urlLoader: URLLoader = new URLLoader( );
     urlLoader.dataFormat = URLLoaderDataFormat.BINARY;
     urlLoader.addEventListener(Event.COMPLETE, onLoadingComplete );
        urlLoader.load( new URLRequest(file.url) );
private function onLoadingComplete( e: Event ):void
     var dispLoader: Loader = new Loader( );
     dispLoader.contentLoaderInfo.addEventListener( Event.COMPLETE, onParsingComplete);
     dispLoader.loadBytes( e.target.data );
     //counter++ --> here end up with counter = 1024
private function onParsingComplete( e: Event ):void
     var img: BitmapImage = new BitmapImage( );
     img.source = (e.target.content as Bitmap).bitmapData;
     _images.push( img );
     counter++; --> here end up with counter = 412, 405, 512 or in debug mode around 380

Answer 1

I've been doing a batchLoader loading batch of 100 images every 2sec... and it works; so it seems that when there is too many eventListeners running, they get ignored. I will need to do a more robust workaround for this, but...
Here is a code snipplet:
private var files:Array;
private var offset:int = 0;
private const BATCH:int = 100;
var timer:Timer = new Timer(2000, Math.ceil(files.length/BATCH));
timer.addEventListener(TimerEvent.TIMER, batchLoad);
timer.start();
private function batchLoad(e:TimerEvent):void {
          var file:File;
          var urlLoader: URLLoader;
          for (var i:int=offset; i<offset+BATCH && i<files.length; i++)  {
//                    for each( var file: File in files ) {
          file = files[i];
          if ( ! file.isDirectory && file.extension == "jpeg" || file.extension == "jpg" || file.extension == "png" ) {
               urlLoader = new URLLoader( );
               urlLoader.dataFormat = URLLoaderDataFormat.BINARY;
               urlLoader.addEventListener(Event.COMPLETE, onLoadingComplete );
               urlLoader.load( new URLRequest(file.url) );
               counter++;
     trace ("counter: "+counter);
     offset += BATCH;