I found a door that are hidden inside a wall.

The door cannot be used by players, but IA can open this door and walk through the wall.

A hidden door need to be deleted. Maybe it is also a problem with other "buildings" in the game. I recommend watching the video it show everything
http://www.youtube.com/watch?v=FA8tWlmVyh0&feature=youtu.be

I have seen AI's walk through the wall in other buildings in that city, maybe you need to check the buildings that have 2 levels.

Also it is difficult to place any ai in a special possition inside a house.
Normal i place the ai on the street and then I make a waypoint on the building and select example possition 5.
But the AI find it very difficult to navigate, and often get stuck in walls or inside walls.