Thanks for the tip melikia but all objects are set to display smooth shaded.

I have narrowed it down to only happening with terrains.  I can have as many ojbects and plants in a scene as I want and all display right.  Load a terrain....fine too - even if I select one of the other objects in the scene.  BUT - load a SECOND terrain and the first terrain reverts to a box in all 4 views.

Gill