Icons broken on SSL secured pages

Hi!

I’m using the WordPress HTTPS (SSL) plugin to force https in certain pages. But now the theme icons (such as arrows, stars…) only show in the secure pages but appear broken in the non secure pages. Do you know what could be causing it, and how to fix it?

I did install another plugin called Fix SSL/Non-SSL Links but it doesn’t seem to be doing anything…

Thanks for your help!