I have a serious problem with my upper assembly all the way down to my lower level part file. The wall assembly is inserted in the upper assy twice as the same config. This should be no problem. The front plane and origin on the wall part and assembly have somehow "migrated" over 200 feet from the body of the model or maybe the model has migrated away from the plane and origin. The upper level assy was rock solid until this morning. I made a new cofig and changed some mates from coincident to distance to be able to configure the distance the model was mated in the upper level assy. Once these mates were added things started going haywire.