AS3 mouse events not firing when mouseX = 0 - actionscript-3

Question

I'm creating what should be a very simple, full screen drag and drop game in Flash Develop. It works fine except in one frustrating instance.
I add items to the stage, add MOUSE_DOWN listeners to them and start dragging when one hears that listener. I then add a MOUSE_UP listener to figure out when to stop the drag. Again, this works fine unless mouseX = 0. When the mouse is all the way to the left of the screen and I mouse up or mouse down no listener is fired. I also took it out of full screen mode and if the mouse is at or below 0 no mouse events will fire.
What in the world is going on?
private function itemSelectedHandler(e:MouseEvent):void
{
thisItem = GameItem(e.currentTarget);
thisItem.startDrag();
stage.addEventListener(MouseEvent.MOUSE_UP, itemUnselectedHandler, false, 0, true);
}
private function itemUnselectedHandler(e:MouseEvent):void
{
stopDrag();
stage.removeEventListener(MouseEvent.MOUSE_UP, itemUnselectedHandler);
thisItem.removeEventListener(MouseEvent.MOUSE_DOWN, itemSelectedHandler);
}

Answer 1

You are calling stopDrag on the class and not the dragged sprite. Try something like the following :
package
{
public class Main extends Sprite
{
private var _draggedSprite:Sprite = null;
public function Main():void
{
if (stage) init();
else addEventListener(Event.ADDED_TO_STAGE, init);
}
private function init(e:Event = null):void
{
removeEventListener(Event.ADDED_TO_STAGE, init);
// entry point
for (var i:int = 0; i < 10; i++)
{
createBox();
}
}
private function createBox():void
{
var sp:Sprite = new Sprite();
sp.graphics.beginFill(0xff0000, 1);
sp.graphics.drawRect(0, 0, 30, 30);
sp.graphics.endFill();
sp.addEventListener(MouseEvent.MOUSE_DOWN, onMouseDown);
sp.x = Math.random() * (stage.stageWidth - 30);
sp.y = Math.random() * (stage.stageHeight - 30);
addChild(sp);
}
private function onMouseDown(e:MouseEvent):void
{
var sp:Sprite = e.target as Sprite;
sp.startDrag();
_draggedSprite = sp;
stage.addEventListener(MouseEvent.MOUSE_UP, onMouseUp);
}
private function onMouseUp(e:MouseEvent):void
{
_draggedSprite.stopDrag();
_draggedSprite = null;
stage.removeEventListener(MouseEvent.MOUSE_UP, onMouseUp);
}
}
}
This worked for me when mouseX=0 in fullscreen mode.