Can you be more specific about what you mean wrt "Nebraska and South Dakota"...do you mean its all flat or all farms or what?
I just tried grabbing a section from CBI. I used Lat-43 long-83 and width-25 (just a guess). I had no trouble getting the region into the AH editor and it appears correct (yeah, I know that doesn't help you).
Couple things to try/check:
1. Have you set your terrain size in the AH editor to 512x512. My stuff gets output in that size.
2. Check a file called terr.bmp in the AH Editor's terrain folder that contains your CBI map. That bmp is output by the AH Editor and it gives you and *upside down* elevation plot of the region the AH Editor has loaded. Its hard to read real well tho b/c the scale is tight but you should be able to make out major features.
I can send you my *.typ and *.elv files if you think they will help you diagnose.
-Ogre
[This message has been edited by Ogre (edited 08-18-2000).]