Tween smoothness


I'm using a Tweener to move an rectangle in or out in a Flash Template.

Code: Select all

Tweener.addTween(twitterbalk, {x:-1400, transition: "easeOutExpo", delay: 1.0, time:0.5});

Evertyhing in this templates works smooth except the moving of this rectangle. You can see it flickering especially when the easing is done.
Does anyone know how I can improve this tween so it looks more smooth?