AS3 swf loaded as AVM1Movie

Question

I have an as3 proj in flex.
I have a custom class Screen which is complied into a swf (by
flex)
I'm loading this file via a Loader..., then passing data up
to it on INIT.
fine that works great for the first time, second time, then
on the third time nothing.
when I trace for the type of the Loader.content, the first
two times it traces [Screen,Object] as expected but on the third
time it traces [AVM1Movie, Object].
what's this about?? is it some security thing??
the relevent code is below - the path resolves in all cases
to the same path (..../SimpleScreen.swf)
// ActionScript file
package gs.ctl
// imports
import flash.display.DisplayObjectContainer;
import flash.display.Loader;
import flash.events.Event;
import flash.events.EventDispatcher;
import flash.net.URLRequest;
import flash.system.ApplicationDomain;
import flash.system.LoaderContext;
import gs.mdl.LoadXmlUnicode;
import gs.vw.Screen;
import mx.utils.StringUtil;
import utils.LogEvent;
public class Navigator extends EventDispatcher implements
INavigator{
private var _currentScreenLoader:Loader
private var _currentScreen:Screen
private var _currentScreenXml:XML
private var _screenSetXml:XML
private var _rootScreen:DisplayObjectContainer
private var _pathUserRoot:String
private var _pathData:String
private var _pathAssets:String
private var _URLscreenSet:String
private var _legalScreenItems:XMLList
private function _changeScreen():void{
var URLReq:URLRequest = new
URLRequest(_pathUserRoot+"\\"+_pathAssets+"\\"+_currentScreenXml.url);
var context:LoaderContext = new LoaderContext();
context.applicationDomain = ApplicationDomain.currentDomain;
_currentScreenLoader=new Loader();
_currentScreenLoader.contentLoaderInfo.addEventListener
(Event.INIT, _initHandler)
_currentScreenLoader.load(URLReq, context);
private function _initHandler(event:Event):void{
if(_rootScreen.numChildren==2)_rootScreen.removeChildAt(0)
trace("type = "+_currentScreenLoader.content)
_currentScreen=Screen(_currentScreenLoader.content);
_rootScreen.addChild(_currentScreen)
_currentScreen.setData(screenXml, _legalScreenItems,
_pathUserRoot+"\\"+_pathAssets+"\\");
_currentScreenLoader.unload();

Answer 1

-- When u say first time, seccond.... you mean each time you
compile your flex applicaction?
I mean every time the changeScreen function is called... ie
at run time.
strange eh??
this is no longer an urgent issue, as i've change the
architecture now (much better :~) but I would like to know whats
happening