Issues with movieClip quality

Hello everyone…

does anybody knows why when i apply a rotationX property with scaleX and scaleY the movieClip loses all quality and if i leave only the scales the quality stays intact???

this is the script that im using:

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for (var f:Number=0;f<estados.length;f++)
{
Tweener.addTween(estados[f], {x:-150,y:50,scaleX:.3,scaleY:.3,rotationX:Math.random() *360,rotationY:Math.random() * 360,enfoque:8,time:2,transition:“easeOutExpo”});
}
Tweener2.addTween(spliced[0], {x:100,y:-40, scaleX:spliced[0].escala, scaleY:spliced[0].escala, time:1, transition:“easeOutExpo”});

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this makes the movieClips incredibly pixelated, but if i remove the rotationX and rotationY parameters from the first tweener everithing look perfect

Any ideas?

Thanx alot