Well this is embarrasing but it appears I got it wrong in the tutorial. Although the turrets I made track the enemy quite well and fire quite nicely if you blunder into them the game falls over.
Worse yet I can`t figure out what the hell I`m doing wrong. Here's how I made the turrets.
1) Make a Cube.
2) Make a second cube that sits on almost on top of the first but is indented a little bit.
3) Click on the Move Axis to centre button for both boxes
4) Move the axes down for the top box.
5) Attach lights to both boxes
6) Call the first set Turret01
7) Call the second set Turret01-arm
8) Attach the Turret arm to the base.
I`ll be buggered if I can figure out what's wrong with that set up especially as I`ve just spent 2 hours messing about with it slightly to see if I could make them work and still not crash when I bump into them. I`ve tried the pofs on another computer just in case it's just that my copy of FS2 is screwed but the result is exactly the same. If anyone knows what the hell I`m doing wrong please pipe up.
If that doesn`t give enough detail try
this file which contains the pof and cob.
*goes off to contemplate a career in pig farming where I won`t have to touch another computer ever again*
EDIT: Now how on Earth did this topic end up here? I`m sure I put it in Modding. I guess some days nothing goes right!