If you try to unload a clip during the progress, on
onloadError is broadcasted.
So you should define "MovieClipLoader.onLoadError " actions
to take care of this situation.
There's definitely an error in your code: the autoSize
property should be true or false (not right?).
It's difficult to say if there's a problem with twFade.yoyo()
if you don't include that function in your code. Put a trace action
in your onRollOut function and you'll see if the function is called