I sound really retarted on this, but bear with me. When I try making some certain walls, namely the first wall Village01 I think it is. And on many others, it will only make part of the wall, and sometimes it will have a little pattern like this -_-_-_-_-_ and there will be one wall segment right here ------------------- ^^^^^^^^ and so on. I really annoys me. :x :x :x :-x :-x :-x :-?
it only does that if there is something conflicting with the wall or if the flooring isn't right inside your building. all of the space needs to have correct flooring to be classified as "indoors" according to the editor...
Generally, when it does that, you are putting your walls down on tiles that are "inside" tiles on one side and "outside" tiles on the other side. Most of the time when I have that happen it's because I built a wall, then went back over it after putting in windows, but without deleting the windows. I've found that most of the time when I have that problem it works best to just delete the wall, paint over the tiles with a definite outside tile like dirt, then try again to build the wall.