could be my browser (opera, I used firefox before but opera is much faster), but I can't watch this online and the orientation is off (the commentaries are top, only half of the screen is shown and the navigation bar is cut in half if I try to scroll up). Downloading works fine, though.

This should be after "Render Layers" (right now, August 2016, this is listed before "Render Layers" lesson in the left column)