The Inspector has gone AWOL!

In my current project there is suddenly nothing visible in the Inspector box on the Project window in N13, N12, N11 or N7. Other projects display the contents as normal. See pic below.

What could have happened here?
Any Idea how to fix it?

The Project is active, and a track is selected?

Well the project is active but I think you are right that nothing was selected. Selecting a track solved the problem. However, whenever I open a project something is always automatically selected - a track, folder, group etc. That has always been the way it worked as far as I know. I have no idea how to have nothing selected.