When you are on the Dashboard, or on any page in courseware, the logo in the Header links to /dashboard, the logo in the footer links to edX home page. This is a serious UX problem. One would expect two identical linked images to link to the same location. From a screen reader users perspective, the issue is even more explicit; the link text for both says "edX Home page" leading the user to believe that following either link will take them to edx.org, not courses.edx.org/dashboard.
Since clicking on your username already brings you to your dashboard, and (since the beginning of time) clicking on logos brings you to the website's home page on 99.9% of sites on the Interwebs, I would expect clicking on our logo to do the same. The user should not be aware of the difference between our marketing site and our courseware.