They most frequently happen with a change from a cell to a cell, i.e going into a town going into a room anywhere where you are teleported.
They also happen from just wandering around, or sometimes even loading up saved games (however if I try a second time it doesn't CTD)
Active Mod Files:00 Oblivion.esm01 Jog_X_Mod.esm02 ScreenEffects.esm03 All Natural Base.esm [Version 0.9.9]04 Francesco's Leveled Creatures-Items Mod.esm05 Francesco's Optional New Items Add-On.esm06 Cobl Main.esm [Version 1.71]07 Qarls_Harvest.esm08 Oscuro's_Oblivion_Overhaul.esm [Version 1.34]09 Mart's Monster Mod.esm [Version 3.7b3p3]0A FCOM_Convergence.esm [Version 0.9.9MB3]0B Armamentarium.esm [Version 1.35]0C Artifacts.esm0D HorseCombatMaster.esm** TNR ALL RACES FINAL.esp0E Unofficial Oblivion Patch.esp [Version 3.2.6]0F DLCShiveringIsles.esp10 Francesco's Optional Chance of Stronger Bosses.esp11 Francesco's Optional Chance of Stronger Enemies.esp12 FCOM_Francescos.esp [Version 0.9.9]13 FCOM_FrancescosItemsAddOn.esp [Version 0.9.9]14 FCOM_FrancescosNamedBosses.esp [Version 0.9.9]15 All Natural - Real Lights.esp [Version 0.9.9]16 All Natural.esp [Version 0.9.9]17 All Natural - SI.esp [Version 0.9.9]18 Hear-Me-Not.esp++ Item interchange - Extraction.esp [Version 0.74]19 Qarls_Harvest.esp1A Xia_Nhary_TwilightAssassin.HGEC1.1Normal.esp1B Enhanced Economy.esp [Version 4.0.6]1C Oblivion Alive.esp1D Immersive Travelers.esp1E Map Marker Overhaul.esp [Version 3.4]1F Map Marker Overhaul - SI additions.esp [Version 3.0.2]20 Crossbows of Cyrodiil.esp21 DBShadowSet.esp22 Thieves Arsenal.esp23 Cobl Glue.esp [Version 1.69]24 Cobl Si.esp [Version 1.63]25 OOO 1.32-Cobl.esp [Version 1.69]26 FCOM_Cobl.esp [Version 0.9.9]27 Bob's Armory Oblivion.esp28 Cheat Bob's Armory Oblivion.esp29 FCOM_BobsArmory.esp [Version 0.9.9]2A Oblivion WarCry EV.esp2B FCOM_WarCry.esp [Version 0.9.9MB3]2C Oscuro's_Oblivion_Overhaul.esp [Version 1.34]2D ArmamentariumLLArmaVendor.esp [Version 1.35]2E FCOM_Convergence.esp [Version 0.9.9Mb3]2F FCOM_RealSwords.esp [Version 0.9.9]30 FCOM_DurabilityAndDamage.esp [Version 0.9.9]31 FCOM_SpawnRatesSlightlyReduced.esp [Version 0.9.9MB3]32 Mart's Monster Mod - More Wilderness Life.esp [Version 3.7b3p3]33 Mart's Monster Mod - More Passive Wildlife.esp [Version 3.7b3p3]34 FCOM_SaferRoads.esp [Version 0.9.9]35 FCOM_LessRats.esp [Version 0.9.9]36 Mart's Monster Mod - Extra Wounding.esp [Version 3.7b3p3]37 Mart's Monster Mod - Looting NPCs & Creatures.esp [Version 3.7b3p3]38 Mart's Monster Mod - No Carrion Rats.esp [Version 3.7b3p3]39 Mart's Monster Mod - Dungeons of MMM.esp [Version 3.7b3p3]3A Mart's Monster Mod - Gems & Gem Dust.esp [Version 3.7b3p3]3B Mart's Monster Mod - Hunting & Crafting.esp [Version 3.7b3p3]3C Mart's Monster Mod - Farm Animals.esp [Version 3.7b3p3]3D Mart's Monster Mod - Diverse WaterLife.esp [Version 3.7b3p3f]3E Mart's Monster Mod - Slof Horses Complete.esp [Version 3.7b3p3]3F Mart's Monster Mod - Diverse Runeskulls Loot G&GD.esp [Version 3.7b3p3]40 FCOM_DiverseGuardUnity.esp [Version 0.9.9]41 FCOM_BobsGuardUnity.esp [Version 0.9.9]42 FCOM_HungersUnitySI.esp [Version 0.9.9]43 FCOM_MoreRandomSpawns.esp [Version 0.9.9]44 FCOM_MoreRandomItems.esp [Version 0.9.9]45 Mart's Monster Mod - Shivering Isles.esp [Version 3.7b3p3]46 ArmamentariumLL4OOO.esp [Version 2.01]47 ArmamentariumLLMagicOOO.esp [Version 1.35]48 PersuasionOverhaul_OOO.esp [Version 1.2]49 PersuasionOverhaul_MMM.esp [Version 1.2]4A zCats & Rats.esp4B OOO-WaterFish.esp [Version 1.34]4C MMM-Cobl.esp [Version 1.69]4D Artifacts.esp4E Artifacts - ArmaCompleteAddon.esp [Version 1.0]4F ICSewerDBsanctuary.esp50 Kragenir's Death Quest.esp51 KDQ - Rural Line Additions.esp52 thievery.esp53 VaultsofCyrodiil.esp54 Whispers of Death Extended.esp55 Wrath of Sithis.esp56 za_bankmod.esp57 Lynges_Thieves_Highway-10256.esp58 The Lost Spires.esp59 Birthsigns Expanded.esp [Version 3.]5A Birthsign Zero.esp5B Oblivifall - Ambiant Dungeon SFX.esp [Version 1.2]5C Oblivifall - Let's Talk!.esp [Version 1.1]5D SupremeMagicka.esp [Version 0.90]5E SM_ShiveringIsles.esp [Version 0.86]5F SM_OOO.esp [Version 0.89]60 SM_MMM.esp [Version 0.89]61 SM_COBL.esp [Version 0.86]62 SM_EnchantStaff.esp [Version 0.80]63 SM_NoSpellLights.esp [Version 0.70]64 SM_Scrolls.esp [Version 0.84]65 SM_SigilStone.esp [Version 0.83]66 MidasSpells.esp67 FearsomeMagicka.esp68 RshAlchemy.esp69 Lightweight Potions.esp [Version 1.1]6A MerchantFriendsBuysStolen.esp [Version 2.0]6B SM Combat Hide.esp [Version 1.2]6C Stealth Entrances v1.esp6D Morrowind Lockpicking.esp6E SM Bounty.esp [Version 1.22c]6F CoblDeathFix.esp [Version 1.20]70 Denock Arrows.esp71 SM Hand Combat.esp [Version 1.0]72 Deadly Reflex 5 - Timed Block with no damage or durability changes.esp73 DeadlyReflex 5 - Combat Moves.esp74 SM_DeadlyReflex.esp [Version 0.86]75 Enhanced Mercantile Progress.esp [Version 1.0a]76 Kobu's Lighter Backpack Mod.esp77 nGCD.esp78 nGCD Birthsigns.esp79 Francesco's Slower skills x1.5.esp7A immersive_caves_auto.esp7B immersive_caves_manual.esp7C Dark Dungeons - SI.esp7D Mart's Monster Mod - Resized Races.esp [Version 3.7b3p3]7E Cobl Races.esp [Version 1.52]7F Stealthier Magic.esp80 TRAP.esp81 Disable Tutorial Text.esp82 Francesco's 7 days respawn time - 1-16 day lenght rescale.esp83 ScreenControls.esp84 Display Stats.esp [Version 1.0]85 BlackGear.esp86 Cobl Silent Equip Misc.esp [Version 01]87 Bashed Patch, 0.esp88 Duke Patricks - Combat Archery.esp [Version 2.5]