Thanks Studio X,
I used Digital Rebellion's Preference Manager to delete my motion preferences. I did it twice and the second time made sure my trash was emptied and then rebooted the computer. It still didn't work, still no HUD.
I am thinking it must have something to do with OSX Mountain Lion because Motion 4 is a few years old and when this problem come up before trashing preferences was enough.
RE: Missing HUD
I am having real problems as I am training in Motion 4 and while I can work around most things in the Inspector, somethings just aren't easy to work around.
I would appreciate so much if someone could help me solve this problem. I wonder whether the fact that none of the function keys work to open things like the Project pane etc may be related to the missing HUD window.