I tried to make a small change in the recruiting turns of a unit, but then I got a CTD right after starting the game.

So I changed it back to original value, and still got the CDT.

Then I copied the backup back in and it worked, so I made the change again and got the CTD again...

Then I brought back the backup once more, and opened it to look at it, and closed it, and I got a CTD (?). It feels like there is Schroedingers cat living in mz EB, as soon as you look at it you screw it up...

What am I missing?