Some options and buttons that I expect to be present right at the front is hidden behind somewhere perhaps under subtab of advanced features. With new UI, please think about keeping much needed things in obvious places.
Some tasks take too many clicks, when it can be done in one click or no click. Follow the rule of one in your new design.
Think of what would take least time for the user.
Give more flexibility on course structure, making it possible to organise courses in multiple layers/levels with features like playlist of videos, instead of current 2layered linear structure only.