Originally posted by bubbleme80 couldn't this be becoz of non-manifold edges?.. like having two faces or somethin... accidentally duplicated on same location and did merge vertices? i dunno.. ima newbie. thats the problem, nonmanifold edges - this is because there is a problem with the normals and/ or since a particular edge is being shared by one or more pieces of geometry. To correct the problem: Polygons -> Clean Up -> Options. In this box, go to "Other" setting tabs and tick nonmanifold geometry- enable normals and geometry and click "Clean up" it will break itself of from the original geometry, its just the way sub-divs work.