Is your terrain a full 512x512 terrain?
If so, you have got to tell the editor that your clipboard map represents the full 512.x512, not the 256x256 that was used in the beta terrain and the current MA terrain.
What you have too do is make a file called... err I forget the name, I will get it for you when I get home from work, that has only the number"512" in it, on the first line.
Will get file name when I get home.
------------------
Vermillion
**MOL**, Men of Leisure
"Real Men fly Radials, Nancy Boys fly Spitfires"