My character is currently in the first plane of Oblivion, the one related to the Breaking the Siege of Kvatch quest, and I had no problems there so far until now; Suddenly, the game is highly unstable and will just randomly crash at any moment, mostly after reloading a save. There just doesn't seem to be a specific trigger however.
I thought it was save game related, but loading an earlier save, and heading to same area doesn't seem to resolve anything.
My load-order list, which I recently adjusted prior to this issue, and might be involved:
TR_OoT_Main.esm
You Are Here.esm
Francesco's Leveled Creatures-Items Mod.esm
Cobl Main.esm
Mart's Monster Mod.esm
CM Partners.esm
Easy_Companion_Share.esm
Younger Hotter NPC's v1.0.esp
Unofficial Oblivion Patch.esp
DLCShiveringIsles.esp
Unofficial Shivering Isles Patch.esp
Natural_Weather_by_Max_Tael.esp
Natural_Habitat_by_Max_Tael.esp
Natural_Water_by_Max_Tael.esp
AliveWaters.esp
AliveWaters - Koi Addon.esp
AliveWaters - Slaughterfish Addon.esp
Added Realistic NPC's v1.0.esp
Ayleid Loot EXtension.esp
Fatality Cam.esp
P1DseeYouSleep.esp
Purge Cell Buffers - Loading.esp
SI Living Economy.esp
DLCHorseArmor.esp
DLCOrrery.esp
DLCVileLair.esp
DLCMehrunesRazor.esp
AyleidMeteorIronWeaponsBASE.esp
AlternativeLightArmors12.esp
Battledress.esp
ClassyClothingCompendium.esp
DaedricCrescentBlade.esp
LootableLichHelm_Hvy.esp
Rogue Sun's Blood Lust Dress.esp
SickleIrons_RT.esp
SilverwareWeapons.esp
VA_DaedricPriestessArmour.esp
LeatherHunterArmour.esp
Daedric Lord Armor.esp
DLCThievesDen.esp
Francesco's Optional Files 1.esp
Francesco's Optional Files 2.esp
Francesco's Optional Files 3.esp
kuerteeWanderingEncounters.esp
Ivellon.esp
AyleidArrows.esp
Fort Baltsine.esp
OldCrowInn.esp
RuinsOfBrenfa.esp
Spear_of_Bitter_Mercy.esp
sunk ships.esp
The Ayleid Steps.esp
TR_Stirk.esp
VOILA - Soldiers of Empire.esp
DLCFrostcrag.esp
Knights.esp
The Lost Spires.esp
ElsweyrAnequina.esp
Faregyl.esp
xuldarkforest.esp
xulStendarrValley.esp
xulTheHeath.esp
XulEntiusGorge.esp
xulFallenleafEverglade.esp
LostSpires-Everglade patch.esp
xulBeachesOfCyrodiilLostCoast.esp
xulBravilBarrowfields.esp
xulAncientRedwoods.esp
xulAspenWood.esp
Moriarcis.esp
Natural_Vegetation_by_Max_Tael.esp
Harvest [Flora].esp
Harvest [Flora] - DLCFrostcrag.esp
Bag of Holding.esp
Cliff's Shacks Basemants-Radiant AI.esp
DS Less Predictable Respawn.esp
fadingtorches v1.3b.esp
M.O.E. - Lycanthropy and Lichcraft.esp
P1DkeyChain.esp
persuasioncompatable1.8.esp
Quest Award Leveller.esp
Quest Award Leveller - Vile Lair.esp
RealisticForceMedium.esp
SetEssentialActors.esp
SupremeMagicka.esp
SM_ShiveringIsles.esp
Syc_AtHomeAlchemy.esp
attack and hide medium v2.1.esp
Deadlier Traps.esp
sycHearNoEvil.esp
Enhanced Grabbing.esp
SamVimes's Feint Death.esp
actors_in_charge.esp
Let There Be Darkness - Cyrodiil + SI.esp
Let There Be Darkness - Knights.esp
Let There Be Darkness - Mehrunes Razor.esp
CM Partners.esp
CM Partners Extra NPCs.esp
ArianaTrudeaux.esp
Francesco's 10 days respawn time - 1-20 day lenght rescale.esp
SPAWN.esp
Get Wet - just droplets.esp
Shining Creatures.esp
Capucine'sEyeSelection.esp
Nightshade_Armor_ConflictFree.esp
Alkwynd.esp
Sunken Chapel.esp
RTBlackEveningDress.esp
PTActorsCare.esp
PTFallingStars.esp
DarknessHollows.esp
Streetvendors.esp
BFG's Enhanced Armory.esp
Weapon Expansion Pack for Oblivion Nthusiasts.esp
Mart's Monster Mod for Fran.esp
Mart's Monster Mod - Gems & Gem Dust.esp
Mart's Monster Mod - Hunting & Crafting.esp
Mart's Monster Mod - Additional Enemy NPC Vars.esp
Mart's Monster Mod - Durability & Damage.esp
Mart's Monster Mod - Fran's leveled quests.esp
Mart's Monster Mod - More Wilderness Life.esp
Mart's Monster Mod - Farm Animals.esp
Mart's Monster Mod - Extra Wounding.esp
Mart's Monster Mod - Safer Quest Locations.esp
Mart's Monster Mod - Dungeons of MMM.esp
Bashed Patch, 0.esp
And also, a log from the weOCPS file:
eax=00000001 ebx=00000000 ecx=00000004 edx=00000099 esi=00000005 edi=00000000 esp=0012ea50 ebp=0012ec50
Sat Nov 20 22:48:15 2010 OCPS build 2009-03-28 prevented crash at offset 0x0007ae0e (eip: 0x0047ae0e, sub_47AC20). Link to 0x0000001c is faulty!
eax=00000000 ebx=02714a70 ecx=78e9b68f edx=00000099 esi=18c73a94 edi=1cb77248 esp=0012ec14 ebp=00000002
Sat Nov 20 22:48:15 2010 OCPS build 2009-03-28 prevented crash at offset 0x0012d448 (eip: 0x0052d448, sub_52D2C0). Link to 0x00000268 is faulty!
eax=00000001 ebx=00000000 ecx=00000004 edx=00000099 esi=00000005 edi=00000000 esp=0012ea50 ebp=0012ec50
Sat Nov 20 22:48:15 2010 OCPS build 2009-03-28 prevented crash at offset 0x0007ae0e (eip: 0x0047ae0e, sub_47AC20). Link to 0x0000001c is faulty!
eax=00000000 ebx=031f45e8 ecx=78e9b68f edx=00000099 esi=18c73a94 edi=1d37ae84 esp=0012ec14 ebp=00000002
Sat Nov 20 22:48:15 2010 OCPS build 2009-03-28 prevented crash at offset 0x0012d448 (eip: 0x0052d448, sub_52D2C0). Link to 0x00000274 is faulty!
eax=00000001 ebx=00000000 ecx=00000005 edx=0000009c esi=00000006 edi=00000000 esp=0012ea50 ebp=0012ec50
Sat Nov 20 22:48:15 2010 OCPS build 2009-03-28 prevented crash at offset 0x0007ae0e (eip: 0x0047ae0e, sub_47AC20). Link to 0x0000001c is faulty!
eax=00000000 ebx=031d3cc0 ecx=78e9b68f edx=0000009c esi=18c73a94 edi=1d246a44 esp=0012ec14 ebp=00000003
Sat Nov 20 22:48:15 2010 OCPS build 2009-03-28 prevented crash at offset 0x0012d448 (eip: 0x0052d448, sub_52D2C0). Link to 0x0000028c is faulty!
eax=00000001 ebx=00000000 ecx=00000007 edx=000000a2 esi=00000008 edi=00000000 esp=0012ea50 ebp=0012ec50
Sat Nov 20 22:48:15 2010 OCPS build 2009-03-28 prevented crash at offset 0x0007ae0e (eip: 0x0047ae0e, sub_47AC20). Link to 0x0000001c is faulty!
eax=00000000 ebx=02734d40 ecx=78e9b68f edx=000000a2 esi=18c73a94 edi=1c69c340 esp=0012ec14 ebp=00000005
Sat Nov 20 22:48:15 2010 OCPS build 2009-03-28 prevented crash at offset 0x0012d448 (eip: 0x0052d448, sub_52D2C0). Link to 0x00000268 is faulty!
eax=00000001 ebx=00000000 ecx=00000004 edx=00000099 esi=00000005 edi=00000000 esp=0012ea50 ebp=0012ec50
Sat Nov 20 22:48:15 2010 OCPS build 2009-03-28 prevented crash at offset 0x0007ae0e (eip: 0x0047ae0e, sub_47AC20). Link to 0x0000001c is faulty!
eax=00000000 ebx=02892868 ecx=78e9b68f edx=00000099 esi=18c73a94 edi=1d3fbd58 esp=0012ec14 ebp=00000002
Sat Nov 20 22:48:15 2010 OCPS build 2009-03-28 prevented crash at offset 0x0012d448 (eip: 0x0052d448, sub_52D2C0). Link to 0x0000028c is faulty!
eax=00000001 ebx=00000000 ecx=00000007 edx=000000a2 esi=00000008 edi=00000000 esp=0012ea50 ebp=0012ec50
Sat Nov 20 22:48:15 2010 OCPS build 2009-03-28 prevented crash at offset 0x0007ae0e (eip: 0x0047ae0e, sub_47AC20). Link to 0x0000001c is faulty!
eax=00000000 ebx=02921c10 ecx=78e9b68f edx=000000a2 esi=18c73a94 edi=1c7239d0 esp=0012ec14 ebp=00000005
Wed Nov 24 18:37:25 2010 OCPS build 2009-03-28 prevented crash at offset 0x0018b246 (eip: 0x0058b246, sub_58B220). Invalid _this_ pointer: 0x1835f6e4 (vtbl: 0x00000000)!
eax=0012f5c0 ebx=0f0371f8 ecx=1835f6e4 edx=00b32b80 esi=2e009f00 edi=0f030bd0 esp=0012f588 ebp=1835f6e4
Wed Nov 24 21:43:31 2010 OCPS build 2009-03-28 prevented crash at offset 0x0018b246 (eip: 0x0058b246, sub_58B220). Invalid _this_ pointer: 0x1cf92940 (vtbl: 0x225fb580)!
eax=0012f5c0 ebx=0f03a240 ecx=1cf92940 edx=00b32b80 esi=2e00a100 edi=0f02f558 esp=0012f588 ebp=1cf92940
Fri Nov 26 19:47:45 2010 OCPS build 2009-03-28 prevented crash at offset 0x0018b246 (eip: 0x0058b246, sub_58B220). Invalid _this_ pointer: 0x0e0d8d8c (vtbl: 0x00000000)!
eax=0012f61c ebx=0e0d8d8c ecx=0e0d8d8c edx=00581a10 esi=18a3761c edi=00000000 esp=0012f5e4 ebp=0e0d8d8c
Fri Dec 03 22:20:04 2010 OCPS build 2009-03-28 prevented crash at offset 0x0001e232 (eip: 0x0041e232, BaseExtraList::GetExtraData). Invalid _THIS_ pointer: 0x181d99c0 (vtbl: 0x20bb53fc)
eax=00000800 ebx=00000000 ecx=181d99c0 edx=00a6fc9c esi=181d99c0 edi=190263dc esp=0012f3d4 ebp=00000000
Fri Dec 03 22:58:16 2010 OCPS build 2009-03-28 prevented crash at offset 0x0001e232 (eip: 0x0041e232, BaseExtraList::GetExtraData). Invalid _THIS_ pointer: 0x1843a1fc (vtbl: 0x213c1418)
eax=00000e00 ebx=00000000 ecx=1843a1fc edx=00a6fc9c esi=1843a1fc edi=19011fd0 esp=0012f3d4 ebp=00000000