Problems with transparent .png files

Hi,

This question is for a project in Flash 9 using ActionScript 3.

I have a series of movieClips in my Library each of which animate 24bit pngs with transparency along their respective timelines. I am then loading them, one at a time, into a container movieClip on the stage and allowing them to play through.

The first version of my script that allows me to step through each of these movieClips seems to work fine, that is the movieclips play exactly as they should.

I then made some changes to the script that layer an intro movieClip and an exit movieClip over each of the animated movieClips at the beginning and end. Suddenly, some of the .pngs in the animated clips have lost their transparency and are displaying jagged halos around them.

I was wondering if anyone has experience with this problem and could maybe save me having to toss out my new script which does make things more flexible…

Thanks for any help!

Phed