I have used this method THOUSANDS of times in testing, no problem.
Your cell may be trying to respawn a mod added object that has been removed from the game.
I have no errors when running the script according to the command line, but when I exit the interior and go and check where bodies were outside they are still there... I am running Sim S and Sim S Conqueror and my troubles with the clearing of cells and respawns started then. Have you ever heard of this issue before?
NukaGirl, PLEASE please tell me you fixed that, it is my problem exactly - installed conqueror, boom, cells don't respawn, or if they do, just containers and no mobs. Sometimes. Sometimes not. Dunno. Can't find anything about this specific problem by searching. Maaaaybe part of the reason that it's an old game, but hell I just revisited it. For 70 hours straight ^^