Your Terrain needs to have 3 Countries.
You should have at least 2 Fields for each Country.
( One should be an Airfield )
You need a HQT ( headquarters ) placed for each Country.
Anything placed as Country should only be Numbered as 1, 2 or 3 nothing higher.
Any Fields placed should be placed in numerical order, don't skip.
The ......... VERY.............first Field placed is field 1, then you got to get rid of the exta tower which is at Grid 10.24 / 10.24.
When a Terrain is first opened, after giving it a name, its surface is all water and the only object in it is, a Tower ( F01twr000 ) at Grid 10.24 / 10.24.
First thing I do when I first start a terrain ( this is after Starting the Editor, Giving the New Terrain Name, Exiting Editor while Saving and then Restarting the Editor and Opening that new Terrain )
is:
First delete that Tower at Grid 10.24 / 10.24
Place Airfields #1
Place Airfields #2
Place Airfields #3
( Make sure each of these 3 Airfields have a Maproom )
Then
Place Headquaters for Country #1
Place Headquaters for Country #2
Place Headquaters for Country #3
Then Exit the Editor and Save While Exiting.
Then when you restart the Editor things should go a lot more smoothly.
Pokie