Sometimes there are hidden planes in blender that you don't see until the .obj file is loaded into DelED. Make sure when you have blender open that there none of those hidden triangles or planes on your doorway and window, if there are make sure you right click and delete them.
DelED also has a hard time loading in files made in blender if the original blender model had too many vertices or triangles, so it attempts to condense them which creates a sudden blockiness to your model once it's loaded in.
