The contents of node inspector embedded in the graph can sometimes overflow off screen, meaning that you have to resize the graph or temporarily activate the external inspector.
See attached screenshot (the black bar at the bottom is the unity status bar.)
Hmm. That should be the case. Can you please open up file GraphEditor.cs and replace the property ‘screenHeight’ and ‘screenWidth’, with the following code and let me know if that works for you after the fact?