Skyrim NPC Crash - What could be the reason?

[Keldis]

So I'm kind of puzzled here, I'm an experienced modder of skyrim but with this problem i run out of ideas, i hope someone here can lighten things a bit up.

 

A few hours ago i started a clean semi mod free game, only mods i am using are graphic overhauls (Env. textures, meshes, skin textures and the likes) and my own race mod made with race compatibility etc, so now here is the deal, sometimes when i enter a cell were i previously killed all the npc's my game crashes, since i have no mods activated that could cause this i am kind of puzzled, i tracked the crash down and the cause are NPC's in that cell that should load but is causing a CTD instead, i figured this out by writing a plugin that writes all REF ID's in that area into a single trace log, the refs are all filtered to only print out NPC's once i had the ref id's i disabled them one by one until i found the faulty ref which was an actor, and it happened in quite a few cells, here are some examples:

 

Embershard Mine: I cleared out this mine and killed everyone, left it by the back entrance, forgot a chest inside i wanted to loot and went back in, but it CTD.

Bleak Falls Barrow Area Lookout: Killed all the bandits here, went to anise cabin after that and wanted to advance toward the barrow again, causing a CTD

Travas Watch: Same as Embershard only vice versa on exiting the interior cell.

 

and a few other cells caused the same problem.

 

And one other thing i noticed is that if i move that faulty Actor to my position with the moveto commands the game would crash as well, if i disable the actor the cell loads fine again, i even tried removing all items of that faulty actor to no avail, and the crash is only caused by actors, no statics no moveables only actors...

 

And now my Question is: What on earth could bug out an actor so much that the game crashes every time the game loads said actor?

Edited December 23, 2013 by Keldis