I don't know about the rest of you, but I cannot get two halfs of a head I've made with symetry to join at the center seam as per the Hexagon PDF help files or in the tutorial in Mike de la Flor's book Carrara 5 Pro Handbook. I select both halves, choose the Average Weld Tool and, viola!, two heads with a gap down the middle! I've tried increasing the value of the tool distance past .10, but it doesn't stick. Sometimes Hexagon just flat-out crashes.