Flash movie initially appears all black!

I have a Flash movie on a website that shows extremely weird behavior in Internet Explorer 6+. When I try loading it with IE, the movie initially appears black. Only when I hover my mouse over it does it respond and start playing.It works perfectly fine in Firefox. I am using Flash MX Professional 2004 and compiling the swf to Flash Player version 6.

I’ve searched around a bunch of forums looking for an answer to this and though some people have posted this question, no one’s been able to answer.
Any ideas?