macbook built-in games and isight

Hi!
I am trying to play the games that come with my macbook (backgammon etc). I have invited a friend (also with a macbook), received the ichat invitation and started playing. The isight light was turned on and I could see myself live video, but not my friend.
However, we are able to initiate an ichat video conference just fine.
Can anyone explain me why we both have this problem?
We both use LittleSnitch, but have given full access to the games.
Thanks a lot.