TransitionManager - fly transition problem

has anyone used the fly transition with the built-in transition manager? i’m getting it to work, but it does a quick flash of the movie that’s flying in (in its final position) before it actually flies in. is it possibly loading too fast? the external swfs are pretty small.

the code:
myListener.onLoadInit = function(target_mc:MovieClip) {
TransitionManager.start(target_mc,{type:Fly, direction:Transition.IN, duration:1, easing:Strong.easeOut, startPoint:6});