Alek hes right, The webwalker will throw an error saying it cannont walk to the location until the door has opened.
I've already sent MGi a lot of data bout it.
Check here:
http://osbot.org/forum/topic/95540-web-walker/
That's exactly the error it's getting on a lot of places.
It will even walk to the door, but once the door is reached it will suddenly gets stuck throwing the error until door has opened
Khaleesi