... Finally I gave up and scrapped this island and started with one I drew in Paintshop and imported into the editor. This new one was not quite as high and had large enough steps to build on. So far, I have had no strange pathing. But now I need to adjust the economy, because it is too easy. I guess the pathing problem was a lot worse than it looked and took so much away from efficiency that it crippled the economy.
I opine that Brf and Junta_Joe never captured the link between the map generator and the game engine which defined the land surface. From all of their descriptions and frustrations, it seems that they never grasped that the map editor tools were not fully documented, and did things which broke the links with the game engine.
That's a shame. They - especially Junta_Joe - just tried to bully their way through since they knew it all.
Use the map editor tools "gently" to make some adjustments to a generated map. Otherwise, draw a grayscale map and import it to the map generator. I opine you will have better luck.