Actionscript working in Firefox & Opera but not IE6?

I have used the localconnection() class to get one .swf to control the playhead in another .swf. It is working perfectly in Firefox and Opera but nothing happens when viewed in Internet Explorer. Has anyone else experienced this? Is it an IE6 bug, is my export settings? Any thoughts would be welcome.

Praha.

P.S. I have the latest version of Flash player in all three browsers.