[Aeraaa]

The only change I've made in the preferences since I've started the game is in one scenario were I lowered the morale of an enemy, because I've found it unrealisticaly high. No other changes were ever made. The possibilities you say may be true for some other instances, but in the one I told you about it was 2 turns after they were spotted. Maybe it was extreme luck to my side.

PS: Another thing that may have mattered is that I now use observed fire much more frequently than when I started the game. Still, in the adjacent hex?