While this in the wrong forum I'm gonna answer anyway. You just need A navmesh that works. Otherwise the A.I. wont work properly. Besides that there's also a navmesh (though I'm not sure wether that has been fixed yet, it's been a while since I launched the CK) wich stops the AI from working currectly if you've entered the room once. Go two cells away and then go back in.
I think this is actually the right forum as he is using the CK and navmeshing. That aside. Though you are correct with the Navmesh bug it is not instant, you would have to quick travel atleast once then back for it to be effected.
@BluesMan, When I test my mods, if it works it will work the first go. Most times I have to remap the navmesh in frront of the door. I make a web pattern and put the teleport marker on the center triangle.