I tried the fix using a sample file and it worked.Thanks, guys.

But I still don't understand it. Every person I asked to look at it could see the proper background color. And yet, I looked at the code and the background color is not specified. So why does everyone see the background color if it is not specified, and why do I suddenly not see it if the others are? I was thinking maybe it happened when I upgraded to Flash Player 9, but I have since uninstalled 9 and reinstalled version 7, and I still have the problem. I cleared my cache completely, problem still exists. I don't like having to go back and re-export every single flash file I have uploaded to the web and having to redo the html, but what really bugs me the most is not understanding what's going on.