skyrimll, about player immortality. When my character becomes immortal (after SD) I was try to uninstall and remove ALL mods (except DawnGuard, HearthFire and Dragonborn), clean save. Nothing happens... Only console command 'recycleactor' removes immortality. Second try - uninstall and remove only SD and use console 'recycleactor'. Immortality removed. Third try - Full MOD List (SD too). Use console 'removeactor'. Nothing happens. Player is immortal. I hope this information may help you to detect immortality bug.