SketchUp Level 1: Drawing & Editing Fundamentals (Fill not working)

In 2D simple plan template no surfaces fill, even with rectangles and when edges are connected. Push/Pull tool (not there yet) does however recognise it as a surface. It just doesn’t change colour like the guys in the video tutorial. I can’t believe I’ve gone wrong this early on in the class. Please help.

How about sharing your .skp file so we can see what you are working with?