Not a real bad bug, but still:
In the 2nd mission, when you, alone, try to reach the 3 guys, if you fight just before you reach the team, and near them, they will be in danger mode, for almost all the forest walkthrough! Anyway I had this problem.
Consequences:
-It took me 20 minutes to get through the forest
-And probably because of that, or I don't know why some dialog ('We heard some guns shot' 'nothing we couldn't handle') came to early, before the fight...