Sprite visibility problems after using low values of alpha - actionscript-3

Question

The plan was very simple: Using MouseEvent.CLICK to hide/show a Sprite. The first click should make it disappear, the second make it visible again.
What actually happened was really odd, as the Sprite didn't become visible when alpha was set to 1 (unless I zoom in or open the Settings menu). Here's an example: http://www.fastswf.com/8BuuY14
private function doStuff(e:MouseEvent):void {
(e.target.alpha == 1) ? e.target.alpha = 0 : e.target.alpha = 1;
}
//Sprite on the left
var outter:Sprite = new Sprite(); //Container sprite (gray background)
outter.x = outter.y = 20;
outter.opaqueBackground = 0xCCCCCC;
outter.addEventListener(MouseEvent.CLICK, doStuff);
var inner:Sprite = new Sprite(); //Interactive child (red square)
inner.graphics.beginFill(0xFF0000);
inner.graphics.drawRect(0, 0, 50, 50);
var speck:Shape = new Shape(); //Reference child (tiny black square)
speck.graphics.beginFill(0x000000);
speck.graphics.drawRect(50, 50, 5, 5);
outter.addChild(inner);
outter.addChild(speck);
addChild(outter);
//Sprite on the right
var cont:Sprite = new Sprite();
cont.x = 100; cont.y = 20;
cont.graphics.beginFill(0xFF0000);
cont.graphics.drawRect(0, 0, 50, 50);
cont.addEventListener(MouseEvent.CLICK, doStuff);
addChild(cont);
I did manage to make it work, by using alpha values equal to or larger than 0.0078125 (in true alpha value), but not 0. Why is this happening?
[EDIT]
Since I established the error could be caused by my IDE, I requested help also at the FlashDevelop community (see comments for link).

Answer 1

After many tests ( on windows 7 with firefox, chrome and IE ), I can confirm that the "problem" ( the abnormal behavior, at least ) is linked to these factors :
Using a MovieClip, Sprite or a Shape ( and some other objects ).
The wmode ( when used ) : direct and gpu.
The Flash Player version : ActiveX, NPAPI and Standalone for the version 14 and up.
I think that's like the Flash Player is "ignoring" to render the object may be for a performance issue that's doing that ( not rendering the object when its alpha is 0 from the 1st time ), because sometimes when I used a Button or CheckBox, ... and I rollover it, a Event.RENDER event is fired on the object and the code is working one time. I saw also that the code is working when executing it for two objects in the same time ...
So to avoid that behavior, you can use the cacheAsBitmap property :
object.cacheAsBitmap = true;
You can also using a ColorTransform object when setting the alpha :
object.transform.colorTransform = new ColorTransform(1, 1, 1, (object.alpha == 1 ? 0 : 1), 0, 0, 0, 1);
Or simply, avoid to use the direct or gpu wmodes ...
Hope that can help.