I don't think nodraw will help you in this instance. Try taking a look at the areaportal and make absolutely sure that the sides of the areaportal are touching the wall. Sometimes, if the grid size is too small, you can leave a tiny, one unit in between teh door and the areaportal. This will result in an error, much like a regular leak would do. If you aren't able to find the leak, try decreasing the grid size and remaking the areaportals. Hope this helps!