media file url – http/https problem

I am running a WP multi-site installation at USC. Everything for the most part is running well. One problem that we are experiencing is that when we upload media files, the media urls are secure (https).

For security reasons we force ssl for administration with this setting:
define(‘FORCE_SSL_ADMIN’, true);

All of our sites, for now, are just regular http. Having secure media links within our non-secure content, breaks the page depending on the browser security settings. We have a large number of content developers. While it would be fine to tell them all to change the url when uploading media, we would prefer to have the url default to http.

Any suggestions?