Hi Kerry, I was wondering if you ever found out what the problem was. I too have almost the same problem. I have the black dust film on the inside of my new frig (around the door),around my air conditioner vents, electrical outlets, on my walls, dark spots on my ceilings and on the end caps (plastic) on my wallpaper and some of my ceilings show many beams and nails. I am concerned about this problem and wonder if it's mold, soot or what. Any help would be greatly appreciated. We had a new roof put on a few years ago(old one taken off) and wonder if this could be moisture trapped in the ceiling. We added another roof vent and we still have the same problem. No one seems to know what could cause this.