Preloader doesnt work after Cacheing -

Question

CS3-AS3
I have an app with a preloader - works fine until the content gets cached, then for some reason wont progress to the next slide - Fullscreen mode is set to full (if that makes a difference). It doesnt seem to happen consistently either.
Here is the code:
stop();
import flash.events.ProgressEvent;
loaderInfo.addEventListener(ProgressEvent.PROGRESS, update);
function update(e:ProgressEvent):void {
    var percent:Number = Math.floor( (e.bytesLoaded*100)/e.bytesTotal );
    preloaderMC.gotoAndStop(percent);
    if (percent==100) {
        play();
//IF IE BROWSER
var percent2:Number = Math.floor( (this.loaderInfo.bytesLoaded*100)/this.loaderInfo.bytesTotal );
if (percent2==100) {
    this.nextFrame();

Answer 1

With old Flash preloaders there was often a brief second where both the bytes loaded and bytes total might be the same small number like -4 or 1 or some such. It seemed to happen more when those items were cached. So if you have (-4*100)/-4 you will get 100 percent.
The trick is to to add something to your conditional like:
if(percent>=100 && bytesTotal>10){}
or something like that.