Quick question for you. Are ALL of the objects in the group positive except for the one that is negative? For example, you want to boolean a poser figure with a sphere to simulate a hole in the chest. I would think that you just need the chest positive and the rest negative. No such luck. EVERYTHING in the group needs to be positive except for the one (or more) negatives. If you have a neutral or intersect in there, the results are going to be unpredictible (if anything actually happens like you see :) HTH.