New browsers show with some of your Joomla templates a security warning when using SSL encryption. This is due to a hardcoding line in the index.php for using the Google fonts. The line
<link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family=<?php echo str_replace(" ","%20",$s5_fonts_highlight); if ($s5_fonts_highlight_style != "") { echo ":".$s5_fonts_highlight_style; } ?>" />
should be changed. With "..
https://fonts.googleapis.com ..." the warning is no longer shown.