User blog comment:WolfeSpeider/Help?/@comment-1992639-20130304120416

Bethesda likes to make its games refer to a lot of external files, not only using scripts to store what happened, but having savegames store tens-of-thousands, if not hundred-of-thousands variables relating to these scripts. The game to look into the script, back at the save, onto the script again, almost like those old spice commercials. :P Usually DLC's alter those scripts through updating them and with so many variables, there's always a little conflict or issue with these scripts, warranting problems. It's a bit archaic sometimes.