The page https://stackexchange.com (kudos for SSL) works flawlessly on all browsers except IE, which says
Internet Explorer blocked this website from displaying content with security ceritifcate errors.
I think this is due to the lines
<!--[if IE]> <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script> <![endif]--> which is easily fixable since https://html5shiv.googlecode.com/svn/trunk/html5.js leads to the same file.
I know that SSL is not a priority right now, but once I saw it, I couldn't un-see it...