this has puzzled me for some time. it doesnt always happen but when it does i lose 4 bars of soap. i use a large flat mold, in other words, not a loaf mold. it is made of wood and has a wood lid. you're not supposed to have to insulate it but i do anyway and it doesn't seem to matter whether i do or not, i've tried both ways. what happens is the corner bars of soap are discolored and white and soft and squishy. the corners of the corner bars that is. it doesnt seem be limited to one type of soap that i make, like oatmeal for example. it seems to be random. this didnt happen till i switched molds, so maybe that corner soap cools to fast? i have tried doubling up on the insulation in the corners but that doesn't seem to make a difference, maybe i need to REALLY insulate those corners. it's just in the corners, not the outer bars, those bars are fine, it's something about the corners. anyway this is not a crisis it just means i can't sell those bars and i get 4 bars for me! but i'd like to solve the mystery and not lose those bars. any thoughts are most appreciated.