Loading Movie Clips

I've got a SWF that loads SWFs into a blank movie clip when a button is pressed.

This works fine for me until i try to load a php driven SWF.

Both work autonomously.

Has anyone encountered this before?

One of my buttons has the following action:

on (release) {
_root.contents.loadMovie("welcome.swf");
}

This loads the welcome.swf into my blank contents movie clip. It loads the SWF ok until i try loading a SWF with dynamic text through PHP.

It just loads the SWF without the text.

When i test the welcome SWF on its own it works fine.

Has anyone had this problem before???