I also get this exact issue. I have noticed that, when I load my CELL, I get a HAVOK error as follows: HAVOK: List shape with child container subshape found in , will not be able to resolve support material for character controller collisions properly. The only way I can seem to solve it is to create a new CELL and copy my dungeon into it. Once I do that, I can get my Draugr to sit in his ambush properly. But it doesnt take long before I get back into a corrupted state and I start all over again. Does anyone know what this error means? What causes it? How to troubleshoot or correct it?