When I roll over an enemy unit I get the same information (basic unit information and terrain information) whether I have the ALT key pressed or not. They *say* that holding the ALT key while mousing over will show combat odds. I am not seeing it, or maybe listing the units on the square is what they consider combat odds.

Can anyone tell me what I am supposed to be seeing, or is this another bug in the game?

Edit: Mea culpa. Helps to have the attacking unit selected. Now I just have to determine whether I am green or red.

If you check out the 4th picture on this page you can see that your combat value is green and the opponent´s are red.

http://www.kalikokottage.com/civ3/sullla/civ4_walk_3.html

Doesn't work for me either, neither the alt-key or the control-key do anything in my game.

example: I have to press esc then save to save, ctrl-s does nothing.

Trying selecting your unit and then right clicking (don't let go!) onto the enemy unit and you should get combat odds.