We've recently made changes to better secure our Moodle site. All Moodle URLs should now begin with "https" rather than "http". Pages may load slightly slower because of this, but the payoff is better security for all of your course content.
If, for some reason, you experience trouble accessing any materials in any of your courses, please let your instructors or the Moodle admins know by replying here or reaching us at moodle(at)mac(dot)edu.
Thank you as always for your patience, and watch this space for more information regarding updates to Moodle.