Error #2025 with Fullscreen Mode Thumbnails

Hi Everyone!

My first time on here, and I'm somewhat new to programming AS3, so please go easy. I have a portfolio page on my website (currently in-process) where I display flash samples. To avoid antiquated and uncontrollable pop-ups and js code etc that could be disabled, I went for a very clean/controlled approach by using flash's fullscreen capability. To achieve this, I am using indivdual swfs as thumbnails. Each thumbnail swf listens for a click. Once clicked it fires off its fullscreen mode, loads an external swf file, and positions my assets (the swf file and a custom exit button) perfectly on the screen according to your specific resolution settings. Everything unloads and goes back to normal via a fullscreen event listener, so it doesn't matter how you exit fullscreen mode (via button or escape or whatever). Everything works great in all browsers I've tested, except...

Problem:

In browsers other than Explorer I get the following error when returning to normal mode. Everything works fine, but the error window pops up. Not too impressive on your sample page obviously .

ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.
    at flash.display::DisplayObjectContainer/removeChild()
    at thumb_right_moves_fla::MainTimeline/fullScreenRedraw()
    at flash.display::Stage/set displayState()
    at thumb_right_moves_fla::MainTimeline/exitFullScreen()

Setup:

On the main stage I have a thumbnail movieclip that displays a graphic and provides the rollover effects etc. I also have an Exit movie clip that serves as a button during fullscreen mode. All code is in a single frame in the Actions layer of the main timeline. There is only 1 frame in the FLA.

My Complete Code:

import flash.display.Stage;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.events.Event;
import flash.events.FullScreenEvent;

var screenWidth:Number;
var screenHeight:Number;
var sampleWidth:Number = 800; // enter actual external content width
var sampleHeight:Number = 500; // enter actual external content height
var stageWidthAdjustment = stage.stageWidth/2;
var stageHeightAdjustment = stage.stageHeight/2;
var contentURL:String = "swf/sample_right_moves.swf"; // enter url to external content
var screenMargin:Number = 10; // set the prefered distance of exit button from screen edge
var contentRequest:URLRequest = new URLRequest(contentURL);
var contentLoader:Loader = new Loader;

// Initial stage setup

exit_mc.visible = false;
thumb_mc.buttonMode = true;
thumb_mc.addEventListener(MouseEvent.CLICK, enterFullScreen);
thumb_mc.addEventListener(MouseEvent.ROLL_OVER, over);
thumb_mc.addEventListener(MouseEvent.ROLL_OUT, out);
stage.addEventListener(FullScreenEvent.FULL_SCREEN, fullScreenRedraw);
stage.addEventListener(Event.RESIZE, resizeDisplay);
stage.scaleMode = StageScaleMode.NO_SCALE;

// Event handlers

function enterFullScreen(event:MouseEvent):void
{
    stage.displayState = StageDisplayState.FULL_SCREEN;   
}

function exitFullScreen(event:MouseEvent):void
{
    stage.displayState = StageDisplayState.NORMAL;
}

function resizeDisplay(event:Event):void
{
    screenWidth = stage.stageWidth;
    screenHeight = stage.stageHeight;
}

function over(event:MouseEvent):void
{
    event.target.gotoAndPlay("Over");
}

function out(event:MouseEvent):void
{
    event.target.gotoAndPlay("Out");
}

// detect fullscreen mode status and perform operations/adjustments

function fullScreenRedraw(event:FullScreenEvent):void
{
    if (event.fullScreen) // full screen setup
    {
       // remove all the thumbnail listeners
        thumb_mc.visible = false;
        thumb_mc.removeEventListener(MouseEvent.CLICK, enterFullScreen);
        thumb_mc.removeEventListener(MouseEvent.ROLL_OVER, over);
        thumb_mc.removeEventListener(MouseEvent.ROLL_OUT, out);
       
        // add all the exit button listeners
        exit_mc.visible = true;
        exit_mc.buttonMode = true;
        exit_mc.addEventListener(MouseEvent.CLICK, exitFullScreen);
        exit_mc.addEventListener(MouseEvent.ROLL_OVER, over);
        exit_mc.addEventListener(MouseEvent.ROLL_OUT, out);   
        exit_mc.x = stageWidthAdjustment + (screenWidth/2) - exit_mc.width - screenMargin;
        exit_mc.y = stageHeightAdjustment - (screenHeight/2) + screenMargin;
       
        // load external sample content into container and position screen-centered
        contentLoader.load(contentRequest);
        addChild(contentLoader);
        contentLoader.x = stageWidthAdjustment - (sampleWidth/2);
        contentLoader.y = stageHeightAdjustment - (sampleHeight/2);
    }
    else // normal screen setup
    {
        SoundMixer.stopAll(); // stops the annoying audio that keeps running even after removing the child
        removeChild(contentLoader); // Problem area??      
        contentLoader.unload(); // not sure if even need this
       
        // add all the thumbnail listeners
        thumb_mc.visible = true;
        thumb_mc.gotoAndPlay("Out");
        thumb_mc.buttonMode = true;
        thumb_mc.addEventListener(MouseEvent.CLICK, enterFullScreen);
        thumb_mc.addEventListener(MouseEvent.ROLL_OVER, over);
        thumb_mc.addEventListener(MouseEvent.ROLL_OUT, out);       
       
        // remove all the exit button listeners
        exit_mc.visible = false;
        exit_mc.removeEventListener(MouseEvent.CLICK, exitFullScreen);
        exit_mc.removeEventListener(MouseEvent.ROLL_OVER, over);
        exit_mc.removeEventListener(MouseEvent.ROLL_OUT, out);       
    }
}