Thank You Terry Alexander. Yes I am using a brand new miter box and saw the quandry is how do I position the molding in the miter box. Lay it flat with bottom of molding on the floor of miter box? standing up with back of molding against miter box. I am doing 45 degree angles BUT I am ending up with these triangular gaps at the top or bottom of the wall when I finish the cut and put it up to the ceiling corners. I can not for the life of me figure it out. I have wasted two 8' pieces already so it is not like I am not trying...Thank you for trying.