3D View Blank/Empty

I am working through the Drainage Layout and Design module on the Bentley LearnServer. I have encountered a problem where I do not see anything in the 3D view. One of the early steps to the module is to change the view controls to see both 2D and 3D views of the project. The 2D view shows up fine but the 3D view appears to show nothin at all. I have tried to fit the view but it remains blank. See below

Could this be a problem with the files I downloaded from Bentley? Or is there something in the settings I need to change?

Any help is appreciated. Thanks