Script crashes IDE and Flash Player but works in browsers

Question

I'm building a game program and I've got a script that loads
an external swf, and then duplicates the clip for the user to play.
It worked until a few days ago when I reinstalled my OS (Mac OS
10.4.11) to fix an unrelated problem. The strange thing is that I
had reinstalled the browser plugin to fix a related problem. Now
the code works in the browser, but crashes the IDE and the Flash
Player every time. I called Adobe Support but they were no help
since it's "project related." I've reinstalled CS3 and Flash
itself, but nothing helps.
Here's the code that crashes:
// INITIALIZE LOADER AND ADD TO STAGE
var myLoader:Loader = new Loader;
addChild (myLoader);
myLoader.contentLoaderInfo.addEventListener (Event.COMPLETE,
isLoaded);
// DUPLICATE CLIP WHEN LOADED
function isLoaded (event:Event):void {
event.target.content.width = 100;
event.target.content.height= 200;
// THIS IS THE LINE THAT CRASHES
var copyClass:Class =
Object(event.target.content).constructor;
var newThing:DisplayObject = new (copyClass);
addChild (newThing);
newThing.x +=50;
myLoader.load (new
URLRequest('coloring/coloring1.swf'));

Answer 1

See this cool mp3 xml player with visualization, playlist and
skins. Fully customisable. Vector.
http://flashden.net/item/mp3-xml-strongplayerstrong-with-visualization-and-skins-vectorise d/11851