Ok there is more to this....

I made a terrain grid.. but that is not what I understand the default grid to be.
I preferences there is a place for color settings, and the color setting are presently grey, with other colors for the x, y and z axes... THIS is the default grid I'm asking about. I as confused by the terrain grid, which appears to be something quite different.

So I still have the question.. How do I find or turn on the default grid in MED?

Thanks! ^_^