Neok44- I was trying to resolve the same bug for week
Do you use Real Injuries/Real hunger mod? I found bug with RI_LootTablePN.esp component, which crash my game when I make save. You must locate the same component (which modify loot table pribably) and disable it. As workaround I found the next.
You must load the game twice before make attempt to save or change location.
And use CASM- it help you do not lose all your saves
Nope wasn't using it. These are the mods i had to disable to get broken steel to work and what they caused:
-The Club House At Megaton - Crashed broken steel on load after main quest -- http://www.fallout3nexus.com/downloads/file.php?id=2722
--- I think it's because it's in megaton, going to try the vault 101 one to test later
-Springvale mini vault - Crashed Broken seteel on load after main quest -- http://www.fallout3nexus.com/downloads/file.php?id=1515
--- Most likely because of the changes in springvale for broken steel
-Wastelandsettler02armor.esp - Caues massive crashes when saving if activated with RemapWaterType.esp
--- I can't even figure out exactly what this mod is so for the time being, don't really care.
-Vltor SBR - Caues massive crashes when saving if activated with RemapWaterType.esp -- http://www.fallout3nexus.com/downloads/file.php?id=5520
--- I have no [censored] clue why this kills saving. makes no sense since all it does is add a weapon.
-Some Katanas - Caues massive crashes when saving if activated with RemapWaterType.esp -- http://www.fallout3nexus.com/downloads/file.php?id=5660
--- exactly the same as above.