Tweening a .png - the drop shadow gets darker on each tween

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Q. What is the expected outcome? What happens instead?
The image should stay intact, the drop shadow becomes darker on each tween 
until its solid black.

Q. What code will reproduce the problem?

// import tweener
import caurina.transitions.Tweener;

stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;

// holds current url/link for current image
var curLink:String = '#';

// delay between slides
const TIMER_DELAY:int = 5000;

// fade time between slides
const FADE_TIME:int =   1;

// reference to the current slider container
var currentContainer:Sprite;
// index of the current slide
var intCurrentSlide:int = -1;
// total slides
var intSlideCount:int;
// timer for switching slides
var slideTimer:Timer;
// slides holder
var sprContainer1:Sprite;
var sprContainer2:Sprite;

// slides loader
var slideLoader:Loader;
// url to slideshow xml
var strXMLPath:String = "slideshow-data.xml";
// slideshow xml loader
var xmlLoader:URLLoader;
// slideshow xml
var xmlSlideshow:XML;

function init():void {
    // create new urlloader for xml file
    xmlLoader = new URLLoader();
    // add listener for complete event
    xmlLoader.addEventListener(Event.COMPLETE, onXMLLoadComplete);
    // load xml file
    xmlLoader.load(new URLRequest(strXMLPath));

    // create new timer with delay from constant
    slideTimer = new Timer(TIMER_DELAY);
    // add event listener for timer event
    slideTimer.addEventListener(TimerEvent.TIMER, switchSlide);

    // create 2 container sprite which will hold the slides and
    // add them to the masked movieclip
    sprContainer1 = new Sprite();
    sprContainer2 = new Sprite();

    mcSlideHolder.addChild(sprContainer1);
    mcSlideHolder.addChild(sprContainer2);

    // keep a reference of the container which is currently
    // in the front
    currentContainer = sprContainer2;
}

function onXMLLoadComplete(e:Event):void {
    // create new xml with the received data
    xmlSlideshow = new XML(e.target.data);
    // get total slide count
    intSlideCount = xmlSlideshow..image.length();
    // switch the first slide without a delay
    switchSlide(null);
}

function fadeSlideIn(e:Event):void {

/*  var bmap:Bitmap = slideLoader.content as Bitmap;
    bmap.smoothing = true;
    bmap.width = 239;
    bmap.height = 123;

    bmap.scaleX = 1;
    bmap.scaleY = 1;

    currentContainer.addChild(bmap);*/

    // add loaded slide from slide loader to the
    // current container
    currentContainer.addChild(slideLoader.content);

    // clear preloader text
    ////mcInfo.lbl_loading.text = "";
    // fade the current container in and start the slide timer
    // when the tween is finished
    Tweener.addTween(currentContainer, {alpha:1, time:FADE_TIME, 
onComplete:function() { slideTimer.start(); }});
}

function switchSlide(e:Event):void {
    // check, if the timer is running (needed for the
    // very first switch of the slide)
    if(slideTimer.running)
        slideTimer.stop();

    // check if we have any slides left and increment
    // current slide index
    if(intCurrentSlide + 1 < intSlideCount)
        intCurrentSlide++;
    // if not, start slideshow from beginning
    else
        intCurrentSlide = 0;

    // check which container is currently in the front and
    // assign currentContainer to the one that's in the back with
    // the old slide
    if(currentContainer == sprContainer2)
        currentContainer = sprContainer1;
    else
        currentContainer = sprContainer2;

    // hide the old slide
    currentContainer.alpha = 0;
    // bring the old slide to the front
    mcSlideHolder.swapChildren(sprContainer2, sprContainer1);

    // create a new loader for the slide
    slideLoader = new Loader();
    // add event listener when slide is loaded
    slideLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, 
fadeSlideIn);
    // add event listener for the progress
    slideLoader.contentLoaderInfo.addEventListener
(ProgressEvent.PROGRESS, showProgress);

    // load the next slide
    slideLoader.load(new URLRequest(xmlSlideshow..image
[intCurrentSlide].@src));

    // change current link
    curLink = xmlSlideshow..image[intCurrentSlide].@link;

    // add handler for click
    mcSlideHolder.addEventListener(MouseEvent.CLICK, onMouseClick);

    // show description of the next slide
    ////mcInfo.lbl_description.text = xmlSlideshow..image
[intCurrentSlide].@desc;
    // show current slide and total slides
    ////mcInfo.lbl_count.text = (intCurrentSlide + 1) + " / " + 
intSlideCount + " Slides";
}

function onMouseClick(e:MouseEvent):void
{
    var request:URLRequest = new URLRequest(curLink);
    navigateToURL(request, "_blank");
}

function showProgress(e:ProgressEvent):void {
    // show percentage of the bytes loaded from the current slide
    ////mcInfo.lbl_loading.text = "Loading..." + Math.ceil
(e.bytesLoaded * 100 / e.bytesTotal) + "%";
}

// init slideshow
init();

Q. What version of the class are you using, and under which development 
environment (IDE version, compiler, etc)?
- Tweener.as // AS3 1.31.74

Please provide any additional information below. Also, please attach 
*small*, sample files with minimum functionality to reproduce the problem 
if possible.

Original issue reported on code.google.com by senditto...@gmail.com on 23 Dec 2008 at 6:06