displacementMap freezing

programming flash
1

Hi guys, Im supposed to make a marquee that has curved dynamic text scrolling through it. I used the displacement map filter for this and it almost works. the only problem is that when the dynamic text field gets to a certain x position, the filter stalls, but the text continues to scroll. Im really at a loss.

heres what I got so far:
http://www.jhvh1134.com/misc/marquee.swf

 
var dPoint:Point = new Point(0, 0);
var dMap:BitmapData = new BitmapData(colorMap.width, colorMap.height , true, 0x808080);
 
dMap.draw(colorMap);
removeChild(colorMap);
 
var dFilter:DisplacementMapFilter = new DisplacementMapFilter ();
dFilter.scaleX = 50;
dFilter.scaleY = 52;
dFilter.componentX = 2;
dFilter.componentY = 1;
dFilter.mode = "color";
dFilter.color = 0x000000; 
dFilter.alpha = 0; 
dFilter.mapPoint = dPoint;
dFilter.mapBitmap = dMap;
textContainer.filters = [dFilter];
textContainer.texty.htmlText = "Around the Marquee";
 
addEventListener(Event.ENTER_FRAME,myFunction);   
 
function myFunction(event:Event) {
    textContainer.texty.x = textContainer.texty.x - 2;
 
    if(textContainer.texty.x < -30){
    textContainer.texty.x = 550;
    }
}

Any help would be great