First off what Sundog had posted about the tower is true
(TE: Placing Base error? <http://bbs.hitechcreations.com/smf/Smileys/default/Forum55/HTML/000139,
the first thing I do before placing any AVAILABLE SHAPES or GROUPS in my terrain is delete the TOWER by selecting it in the (edit objects) mode and then delete object. Then I place an airfield (which already comes with an tower). I find it best to place it over the original (now deleted) towers spot.
IMPORTANT! IMPORTANT IMPORTANT!
What I have found is you MUST HAVE at least 1 AVAILABLE SHAPE (doesn't matter which 1) located at sea level which was the original starting altitude of the terrain. If you don't weird thing happen.
EG. I had a very small map in which I first deleted the original tower and placed AFLrg-S.obg and then AFLrg-S.obg
(selected - new 2). I had all 7 take-off spots and when I crashed the plane I lost all but the hanger spot. Plus ack from enemy field would shoot at me then sometimes they wouldn't. Once I place an AVAILABLE SHAPE (I selected CITY) then OBJECT TYPE (I selected VOID) {I left it field owned 1} at sea level it seem like all my problem ended.
SO FOR THOSE WHO HAVE A MAP ALREADY DONE AND THEY HAVE PROBLEMS
1) make back-up of your terrain folder (don't wanted to be blamed for something going wrong)
2) delete F00TWR0 (tower) in the terrain or by opening your-map-name.oba file with notepad and deleting
F00TWR0,twr1,0.000,0.000,0.000,0.0000,0.0000,0.0000,3328,0,1,-1.00,-1.0,-1,0,0,0
line. (save your changes in notepad)
3)Place an available shape at sea level ( o altitude) in your terrain object type void
4)Then hit build button
5)Exit and save terrain
6)Place your-map-name.res in your AceHigh terrain
7)Start the game and select your map
I HOPE THIS WORKS FOR YOUR TERRAINS
Pokie
Note! If anyone has already downloaded your map in their game before the fix and they connect to your game at a late date using the same terrain name they may get weird things happening. All they have to do is delete their copy of your-map-name.res and then connect to you to get a new one.
This had happened to me and my friend when I was testing.