Well that's odd. When I checked it in the map editor initially it checked out, but just now when I reloaded it I was seeing the corrupted terrain as you described. It looks like the large border mountain values were changed from values like "4194304" to "4.1943e+006".
That never happened before. Come to think of it, I haven't run that code since changing over to Vista.
Sorry for the extra work on your part DakaSha and thanks for the heads up.
