I did locate a possible cause: namely MMM. When I disabled MMM's plugins and rebuild my bashed patch without it, I could load my saves without problem.
Now my immediate problem is solved as after I saved the now MMM-less save, then exited FO3 and reactivated MMM, I found that I could load that save again without any crashing and still keeping MMM.
However I am scratching my head as to how this problem arose. Anyone got a clue what happened and what I can do to prevent it from occurring again?
Load order:
Spoiler
[X] Fallout3.esm
[X] Anchorage.esm
[X] PointLookout.esm
[X] Zeta.esm
[X] ThePitt.esm
[X] StreetLights.esm
[X] BrokenSteel.esm
[X] Unofficial Fallout 3 Patch.esm
[X] CRAFT.esm
[X] CALIBR.esm
[X] Project Beauty.esm
[X] DCInteriors_ComboEdition.esm
[X] RH_IRONSIGHTS.esm
[X] FO3 Wanderers Edition - Main File.esm
[X] Mart's Mutant Mod.esm
[X] RHKBrisaAlmodovar.esm
[X] Enhanced Weather - Rain and Snow.esm
[X] Xepha's Dynamic Weather.esm
[X] Sydney Follower.esp
[X] resetfollowers_v3.3.esp
[X] Unofficial Fallout 3 Patch - Operation Anchorage.esp
[X] Unofficial Fallout 3 Patch - The Pitt.esp
[X] Unofficial Fallout 3 Patch - Broken Steel.esp
[X] Unofficial Fallout 3 Patch - Point Lookout.esp
[X] Unofficial Fallout 3 Patch - Mothership Zeta.esp
[X] DelaySteel.esp
[X] delaypl.esp
[X] delayzeta.esp
[X] Delay ThePitt + Anchorage.esp
[X] DarNifiedUIF3.esp
[ ] Project Beauty- Broken Steel.esp
[ ] Project Beauty- Point Lookout.esp
[ ] HairTradeV1.esp
[X] Josef Greys Kozaburo Hair Style for Fallout 3.esp
[X] Arwen_VisionFX.esp
[X] AgathaRadio30[SR].esp
[ ] RZW_RadioStutterFix.esp
[X] GalaxyNewsRadio100[M].esp
[X] BlackWolf Backpack.esp
[ ] BlackWolf Backpack - Vanilla Big Guns Fix.esp
[ ] BlackWolf Backpack - Anchorage Gauss Rifle Fix.esp
[ ] BlackWolf Backpack - Zeta Drone Cannon Fix.esp
[X] NightvisionGoggles(Powered).esp
[X] Binoculars.esp
[X] 3EFwandererGear.esp
[X] Dragonskin Tactical Outfit.esp
[X] MercenaryArmor.esp
[X] LeatherJacketBlack_eng.esp
[X] Bobbleheads.esp
[X] My_Megaton_House.esp
[X] MMHB_Bar.esp
[X] MMH_Even_More_Storage.esp
[X] DAV_nowads.esp
[X] megatonquick.esp
[X] FO3 Wanderers Edition - Main File.esp
[X] FO3 Wanderers Edition - DLC Anchorage.esp
[X] FO3 Wanderers Edition - DLC The Pitt.esp
[X] FO3 Wanderers Edition - DLC Broken Steel.esp
[X] FO3 Wanderers Edition - DLC Point Lookout.esp
[X] FO3 Wanderers Edition - DLC Mothership Zeta.esp
[ ] FO3 Wanderers Edition - Optional Restore Tracers (automatics only).esp
[ ] FO3 Wanderers Edition - Project Beauty.esp
[X] WeaponModKits.esp
[X] WeaponModKits - OperationAnchorage.esp
[X] WeaponModKits - ThePitt.esp
[X] WeaponModKits - BrokenSteel.esp
[X] WeaponModKits - PointLookout.esp
[X] WeaponModKits - Zeta.esp
[X] WeaponModKits - FWE Master Release.esp
[X] WMK-RH IronSights.esp
[ ] RH_IronSights_Basic_VanillaPlugin.esp
[ ] RH_IronSights_Basic_AnchoragePlugin.esp
[X] RH_IronSights_Basic_PittPlugin.esp
[ ] RH_IronSights_Basic_BrokenSteelPlugin.esp
[X] RH_IronSights_Basic_PointLookoutPlugin.esp
[X] RH_IronSights_Basic_ZetaPlugin.esp
[X] RH_IronSights_Pitt_NewRifleSights.esp
[X] RH_FWE_Bridge.esp
[X] Mart's Mutant Mod.esp
[X] Mart's Mutant Mod - DLC Anchorage.esp
[X] Mart's Mutant Mod - DLC The Pitt.esp
[X] Mart's Mutant Mod - DLC Broken Steel.esp
[ ] Mart's Mutant Mod - DLC Point Lookout.esp
[X] Mart's Mutant Mod - DLC Zeta.esp
[ ] Mart's Mutant Mod - Master Menu Module.esp
[X] Mart's Mutant Mod - FWE Master Release.esp
[ ] Mart's Mutant Mod - FWE Master Release + DLCs.esp
[ ] Mart's Mutant Mod - FWE Master Release + Project Beauty.esp
[X] RHKBrisaAlmodovar - DLC - Anch.esp
[X] RHKBrisaAlmodovar - Custom - PB HD.esp
[X] Brisa - FWE Skill Books Compatibility.esp
[X] Sydney Follower - FWE Dialog Fix.esp
[ ] Sydney Follower - Rayg Face & Hair.esp
[X] Sydney Follower - Ray Citadel Training & Wasteland Guid.esp
[ ] Sydney Follower - Load Order Fix.esp
[X] RemoteControlCompanionsPlus.esp
[X] AmmoRefill.esp
[X] BA_WastelandRestoration.esp
[X] BA_WastelandRestoration_DLCs.esp
[X] DCInteriors_DLC_Collectables.esp
[X] megalight.esp
[X] Realistic Interior Lighting.esp
[X] Realistic Interior Lighting - BS.esp
[X] Realistic Interior Lighting - OA.esp
[X] Realistic Interior Lighting - PL.esp
[X] Xepha's Dynamic Weather - Main.esp
[X] Xepha's Dynamic Weather - Anchorage.esp
[X] Xepha's Dynamic Weather - The Pitt.esp
[X] Xepha's Dynamic Weather - Broken Steel.esp
[X] Xepha's Dynamic Weather - Point Lookout.esp
[X] Xepha's Dynamic Weather - Rain.esp
[X] Xepha's Dynamic Weather - Green Tint Remover.esp
[ ] Xepha's Dynamic Weather - Night Eye Edition.esp
[ ] Xepha's Dynamic Weather - Anchorage (NEE).esp
[ ] Xepha's Dynamic Weather - Rain (NEE).esp
[X] Xepha's Dynamic Weather - Weather Machine (+Rain).esp
[X] ShellRain.esp
[ ] pip60.esp
[X] Clothed Sarah Lyons.esp
[ ] Echo_UseBothGloves.esp
[X] VC Black Shady Hat 11.esp
[X] Comp_dont_steal_xp_hereticus.esp
[X] Dogmeat_WaitMegaton.esp
[X] NoTheftComments.esp
[X] Ammo Press with CALIBR.esp
[X] Easier_hacking_5_8.esp
[ ] Evil Tenpenny Tower Ghouls.esp
[X] phada_natural_regen.esp
[ ] Rayg_Missile_MetalBlaster_Grenade_edit.esp
[X] Zan_AutoPurge_SmartAgro.esp
[X] Bashed Patch, 0.esp
[X] Fallout3.esm
[X] Anchorage.esm
[X] PointLookout.esm
[X] Zeta.esm
[X] ThePitt.esm
[X] StreetLights.esm
[X] BrokenSteel.esm
[X] Unofficial Fallout 3 Patch.esm
[X] CRAFT.esm
[X] CALIBR.esm
[X] Project Beauty.esm
[X] DCInteriors_ComboEdition.esm
[X] RH_IRONSIGHTS.esm
[X] FO3 Wanderers Edition - Main File.esm
[X] Mart's Mutant Mod.esm
[X] RHKBrisaAlmodovar.esm
[X] Enhanced Weather - Rain and Snow.esm
[X] Xepha's Dynamic Weather.esm
[X] Sydney Follower.esp
[X] resetfollowers_v3.3.esp
[X] Unofficial Fallout 3 Patch - Operation Anchorage.esp
[X] Unofficial Fallout 3 Patch - The Pitt.esp
[X] Unofficial Fallout 3 Patch - Broken Steel.esp
[X] Unofficial Fallout 3 Patch - Point Lookout.esp
[X] Unofficial Fallout 3 Patch - Mothership Zeta.esp
[X] DelaySteel.esp
[X] delaypl.esp
[X] delayzeta.esp
[X] Delay ThePitt + Anchorage.esp
[X] DarNifiedUIF3.esp
[ ] Project Beauty- Broken Steel.esp
[ ] Project Beauty- Point Lookout.esp
[ ] HairTradeV1.esp
[X] Josef Greys Kozaburo Hair Style for Fallout 3.esp
[X] Arwen_VisionFX.esp
[X] AgathaRadio30[SR].esp
[ ] RZW_RadioStutterFix.esp
[X] GalaxyNewsRadio100[M].esp
[X] BlackWolf Backpack.esp
[ ] BlackWolf Backpack - Vanilla Big Guns Fix.esp
[ ] BlackWolf Backpack - Anchorage Gauss Rifle Fix.esp
[ ] BlackWolf Backpack - Zeta Drone Cannon Fix.esp
[X] NightvisionGoggles(Powered).esp
[X] Binoculars.esp
[X] 3EFwandererGear.esp
[X] Dragonskin Tactical Outfit.esp
[X] MercenaryArmor.esp
[X] LeatherJacketBlack_eng.esp
[X] Bobbleheads.esp
[X] My_Megaton_House.esp
[X] MMHB_Bar.esp
[X] MMH_Even_More_Storage.esp
[X] DAV_nowads.esp
[X] megatonquick.esp
[X] FO3 Wanderers Edition - Main File.esp
[X] FO3 Wanderers Edition - DLC Anchorage.esp
[X] FO3 Wanderers Edition - DLC The Pitt.esp
[X] FO3 Wanderers Edition - DLC Broken Steel.esp
[X] FO3 Wanderers Edition - DLC Point Lookout.esp
[X] FO3 Wanderers Edition - DLC Mothership Zeta.esp
[ ] FO3 Wanderers Edition - Optional Restore Tracers (automatics only).esp
[ ] FO3 Wanderers Edition - Project Beauty.esp
[X] WeaponModKits.esp
[X] WeaponModKits - OperationAnchorage.esp
[X] WeaponModKits - ThePitt.esp
[X] WeaponModKits - BrokenSteel.esp
[X] WeaponModKits - PointLookout.esp
[X] WeaponModKits - Zeta.esp
[X] WeaponModKits - FWE Master Release.esp
[X] WMK-RH IronSights.esp
[ ] RH_IronSights_Basic_VanillaPlugin.esp
[ ] RH_IronSights_Basic_AnchoragePlugin.esp
[X] RH_IronSights_Basic_PittPlugin.esp
[ ] RH_IronSights_Basic_BrokenSteelPlugin.esp
[X] RH_IronSights_Basic_PointLookoutPlugin.esp
[X] RH_IronSights_Basic_ZetaPlugin.esp
[X] RH_IronSights_Pitt_NewRifleSights.esp
[X] RH_FWE_Bridge.esp
[X] Mart's Mutant Mod.esp
[X] Mart's Mutant Mod - DLC Anchorage.esp
[X] Mart's Mutant Mod - DLC The Pitt.esp
[X] Mart's Mutant Mod - DLC Broken Steel.esp
[ ] Mart's Mutant Mod - DLC Point Lookout.esp
[X] Mart's Mutant Mod - DLC Zeta.esp
[ ] Mart's Mutant Mod - Master Menu Module.esp
[X] Mart's Mutant Mod - FWE Master Release.esp
[ ] Mart's Mutant Mod - FWE Master Release + DLCs.esp
[ ] Mart's Mutant Mod - FWE Master Release + Project Beauty.esp
[X] RHKBrisaAlmodovar - DLC - Anch.esp
[X] RHKBrisaAlmodovar - Custom - PB HD.esp
[X] Brisa - FWE Skill Books Compatibility.esp
[X] Sydney Follower - FWE Dialog Fix.esp
[ ] Sydney Follower - Rayg Face & Hair.esp
[X] Sydney Follower - Ray Citadel Training & Wasteland Guid.esp
[ ] Sydney Follower - Load Order Fix.esp
[X] RemoteControlCompanionsPlus.esp
[X] AmmoRefill.esp
[X] BA_WastelandRestoration.esp
[X] BA_WastelandRestoration_DLCs.esp
[X] DCInteriors_DLC_Collectables.esp
[X] megalight.esp
[X] Realistic Interior Lighting.esp
[X] Realistic Interior Lighting - BS.esp
[X] Realistic Interior Lighting - OA.esp
[X] Realistic Interior Lighting - PL.esp
[X] Xepha's Dynamic Weather - Main.esp
[X] Xepha's Dynamic Weather - Anchorage.esp
[X] Xepha's Dynamic Weather - The Pitt.esp
[X] Xepha's Dynamic Weather - Broken Steel.esp
[X] Xepha's Dynamic Weather - Point Lookout.esp
[X] Xepha's Dynamic Weather - Rain.esp
[X] Xepha's Dynamic Weather - Green Tint Remover.esp
[ ] Xepha's Dynamic Weather - Night Eye Edition.esp
[ ] Xepha's Dynamic Weather - Anchorage (NEE).esp
[ ] Xepha's Dynamic Weather - Rain (NEE).esp
[X] Xepha's Dynamic Weather - Weather Machine (+Rain).esp
[X] ShellRain.esp
[ ] pip60.esp
[X] Clothed Sarah Lyons.esp
[ ] Echo_UseBothGloves.esp
[X] VC Black Shady Hat 11.esp
[X] Comp_dont_steal_xp_hereticus.esp
[X] Dogmeat_WaitMegaton.esp
[X] NoTheftComments.esp
[X] Ammo Press with CALIBR.esp
[X] Easier_hacking_5_8.esp
[ ] Evil Tenpenny Tower Ghouls.esp
[X] phada_natural_regen.esp
[ ] Rayg_Missile_MetalBlaster_Grenade_edit.esp
[X] Zan_AutoPurge_SmartAgro.esp
[X] Bashed Patch, 0.esp