From what I understand, IE6, because of a patent dispute, has changed the way IE6 works when opening activeX content (Flash, Javascript, etc.). Users have to click on the content to make it work.
Check this out:
http://msdn.microsoft.com/ieupdate/default.aspx
and this:
http://news.zdnet.co.uk/software/0,1...9254968,00.htm
I have some sites with Flash that work this way in IE6, but IE7 works fine.
Peace