the link should be
https://macromedia... Is it a flash https warning or is it the browser https warning?
If browser:
Is there anything else on the page that is pointing to http? Do you have blank iframes?
You might want to start to comment out sections of the page and see what causes the warning to come up.
If flash:
need to look at the documentation on Flashes security, I know the new version they changed the rules when it reals data files linked to http.
Eric