You need to regenerate object LOD whenever you move, add or remove *ANY* object that has 'use distant lod' set (or use tree lod?) To regenerate object LOD you first need to delete the old object LOD too, or geck just goes "hey its already done, nothing for me to do!" Fallout 'binds' objects to there LOD based on where they are and the order of objects(?). If they arnt exactly where LOD says they should be and in the right order, fallout gets confused and no longer knows when to display the real object and when to display the LOD. (note, totaly seperate from terrain LOD and object lod only takes a few seconds, it also generates a new LOD texture atlas for the worldspace)