[terbooter]

А loadBytes...
Попробуйте выставить
allowLoadBytesCodeExecution свойство для LoaderContext

var myLoaderContext:LoaderContext = new LoaderContext();
myLoaderContext.allowLoadBytesCodeExecution = true;
 
var mySwfLoader:SWFLoader = new SWFLoader();
mySwfLoader.loaderContext = loaderContext;
mySwfLoader.addEventListener(Event.COMPLETE, handleLoadComplete);
mySwfLoader.addEventListener(HTTPStatusEvent.HTTP_STATUS, handleLoadFault);
mySwfLoader.load(myByteArray);