that error means that there are links on the page that use the standard http protocal.
The home page has links back to Adobe to get the latest flash player for the charts:
<h4>Content on this page requires a newer version of Adobe Flash Player.</h4>
<p><a href="http://www.adobe.com/go/getflashplayer"><img src="http://www.adobe.com/images/shared/download_buttons/get_flash_player.gif" alt="Get Adobe Flash player" /></a></p>
adobe does not offer those under an HTTPS link.