arcady What looks like may be happening is you have some kind of open polyline or maybe multiple split verticies. Tighten the circle #1 by welding vertices with a tolerance less than the distance between 2 of the vertices. This should close up any holes or multiple vertices. My usual tolerance it .1, but judging by the magnification of your mesh it might have to be less than that. Repeat with circle #2 and try to loft to 3. Hard to see if there are any open polys or stuff... Hope this helps Ken