My next thought was that something might be inexplicably causing problems with me just adding a new mod into my LO, so I tested this by activating a Bash merged plugin (to increase the number of loaded mods by one), but the game loaded just fine with that. I'm nowhere hear the 255 active mod limit, nor am I near the 400 ESM/ESP/BSA limit either. This problem appears to be isolated to LTPD, as the problems went away completely when the mod was uninstalled. Anyone have any ideas why I am unable to use this mod?
Load Order (with LTPD in the spot BOSS recommended to me, although it has obviously been booted now):
Spoiler
Active Mod Files:00 Oblivion.esm01 TR_OoT_Main.esm02 All Natural Base.esm [Version 1.0]03 Cobl Main.esm [Version 1.73]04 Oscuro's_Oblivion_Overhaul.esm [Version 1.34]05 Mart's Monster Mod.esm [Version 3.7b3p3]06 Mart's Monster Mod for OOO.esm [Version 0.9.9MB3]07 Armamentarium.esm [Version 1.35]08 Kvatch Rebuilt.esm09 Better Cities Resources.esm [Version 4.8.3]0A Progress.esm [Version 2.2]0B Unofficial Oblivion Patch.esp [Version 3.3.3]0C Oblivion Citadel Door Fix.esp0D DLCShiveringIsles.esp0E Unofficial Shivering Isles Patch.esp [Version 1.4.0]0F Better Cities .esp10 LoadingScreens.esp11 All Natural.esp [Version 1.1]12 All Natural - SI.esp [Version 1.0]13 AN Scripts.esp14 Enhanced Water v2.0 HD.esp++ Enhanced Water v2.0 HD - SI Addon.esp [Version 0.1]++ Symphony of Violence.esp15 MIS Low Wind.esp16 Rainbows.esp17 All Natural - Real Lights.esp [Version 1.1]18 WindowLightingSystem.esp19 Akatosh Mount By Saiden Storm.esp++ Item interchange - Extraction.esp [Version 0.78]1A Enhanced Economy.esp [Version 5.1]1B FF_Real_Thirst.esp1C DropLitTorchOBSE.esp [Version 2.4]1D Duke Patricks - Friendship Ring For Companion Detection.esp [Version 1.8]1E FormID Finder4.esp1F Map Marker Overhaul.esp [Version 3.8]20 Map Marker Overhaul - SI additions.esp [Version 3.5]21 Enhanced Hotkeys.esp [Version 1.4]22 DLCHorseArmor.esp23 DLCHorseArmor - Unofficial Patch.esp [Version 1.0.6]24 DLCOrrery.esp25 DLCOrrery - Unofficial Patch.esp [Version 1.0.4]26 DLCVileLair.esp27 DLCVileLair - Unofficial Patch.esp [Version 1.0.6]28 DLCMehrunesRazor.esp29 DLCMehrunesRazor - Unofficial Patch.esp [Version 1.0.5]2A DLCSpellTomes.esp++ DLCSpellTomes - Unofficial Patch.esp [Version 1.0.1]2B Adonnays Elven Weaponry for NPCs.esp2C DLCThievesDen.esp2D DLCThievesDen - Unofficial Patch.esp [Version 1.0.7]2E Cobl Glue.esp [Version 1.73]2F Cobl Si.esp [Version 1.63]30 FF_Real_Thirst, Cobl.esp++ Cobl Tweaks.esp [Version 1.73]31 Oscuro's_Oblivion_Overhaul.esp [Version 1.34]32 OMOBS.esp [Version 1.0]33 OMOBS_SI.esp [Version 1.0]++ Adonnays Elven Weaponry for NPCs - Armamentarium piggyback.esp34 OOO 1.32-Cobl.esp [Version 1.72]35 Mart's Monster Mod for OOO.esp [Version 0.9.9MB3]++ Mart's Monster Mod - Shivering Isles.esp [Version 3.7b3p3]++ Mart's Monster Mod - Looting NPCs & Creatures.esp [Version 3.7b3p3]++ Mart's Monster Mod - Less Bone Loot.esp [Version 3.7b3p3]++ Mart's Monster Mod for OOO - LessReaversInGates.esp [Version 0.9.9MB3]++ Mart's Monster Mod - No Balrogs.esp [Version 3.7b3p3]++ Mart's Monster Mod - Spawn Rates - Reduced.esp [Version 3.7b3p3]36 Mart's Monster Mod - Safer Quest Locations.esp [Version 3.7b3p3]++ Mart's Monster Mod - Friendlier Factions OOO.esp [Version 3.7b3p3]37 Mart's Monster Mod - Farm Animals.esp [Version 3.7b3p3]++ ArmamentariumLL4OOO.esp [Version 2.01]++ ArmamentariumLLMagicOOO.esp [Version 1.35]38 LoadingScreens-OOO.esp++ MMM-Cobl.esp [Version 1.73]39 Kvatch Rebuilt.esp++ Kvatch Rebuilt - OOO Compatibility.esp3A Kvatch Rebuilt Weather Patch.espXX LetThePeopleDrink.esp <<<<<<<<<<<<<<<<<<<<<<<<<< If it worked, it would go here. COBL aware version, obviously.3B The Ayleid Steps.esp [Version 3.4]3C TR_Stirk.esp3D DLCBattlehornCastle.esp3E DLCBattlehornCastle - Unofficial Patch.esp [Version 1.0.5]3F DLCfrostcrag.esp40 Kvatch Rebuilt_Frostcrag Reborn.esp41 FrostcragRebornCobl.esp42 Knights.esp43 Knights - Unofficial Patch.esp [Version 1.1]++ Mart's Monster Mod for OOO - Knights .esp [Version 0.9.9MB3]44 The Lost Spires.esp45 AFK_Weye.esp [Version 2.2.COBL]46 MannimarcoRevisited.esp47 MannimarcoRevisitedOOO.esp [Version 0.1]48 road+bridges.esp [Version 4.5.8]49 Feldscar.esp [Version 1.0.6]4A Vergayun.esp [Version 1.0.6]4B Faregyl.esp [Version 1.0.10]4C xuldarkforest.esp [Version 1.0.4]4D LostSpires-DarkForest patch.esp4E xulStendarrValley.esp [Version 1.2.2]4F xulTheHeath.esp50 XulEntiusGorge.esp51 xulFallenleafEverglade.esp [Version 1.3.1]52 LostSpires-Everglade patch.esp [Version 1.2]53 xulColovianHighlands_EV.esp [Version 1.2.1]54 xulChorrolHinterland.esp [Version 1.2.2]55 xulBeachesOfCyrodiilLostCoast.esp [Version 1.6.4]56 xulBravilBarrowfields.esp [Version 1.3.2]57 xulLushWoodlands.esp [Version 1.3.1]58 xulAncientYews.esp [Version 1.4.3]59 xulAncientRedwoods.esp [Version 1.6]5A xulCloudtopMountains.esp [Version 1.0.3]5B xulArriusCreek.esp [Version 1.1.3]5C xulPatch_AY_AC.esp [Version 1.1]5D xulRollingHills_EV.esp [Version 1.3.3]5E xulPantherRiver.esp5F xulRiverEthe.esp [Version 1.0.2]60 xulBrenaRiverRavine.esp [Version 1.1]61 xulImperialIsle.esp [Version 1.6.6]62 xulBlackwoodForest.esp [Version 1.1.0]63 xulCheydinhalFalls.esp [Version 1.0.1]64 KvatchRebuilt-CheydinhalFalls patch.esp65 xulAspenWood.esp [Version 1.0.2]66 xulSkingradOutskirts.esp [Version 1.0.1]67 xulSnowdale.esp [Version 1.0.1]68 Feldscar+Snowdale Patch.esp [Version 1.0]69 FrostcragReborn-Snowdale patch.esp6A SnowdaleOOOPatch.esp6B xulCliffsOfAnvil.esp6C OOOCliffsofAnvilPatch.esp [Version 1.0]6D NRB4+UL-II Patch.esp [Version 5.0.1]6E ImpeREAL Empire - Unique Forts.esp6F ImpeREALForts+LostSpires Patch.esp [Version 1.0.1]70 Better Cities - House price patch.esp [Version 1.0]71 Harvest [Flora].esp [Version 3.0.0]++ Harvest [Flora] - Shivering Isles.esp [Version 3.0.0]++ Harvest [Flora] - DLCVileLair.esp [Version 3.0.0]72 Harvest [Flora] - DLCFrostcrag.esp [Version 3.0.0]73 HUD Status Bars.esp [Version 2.0.1]74 kuerteeInventoryIsABackpack.esp75 Enhanced Economy - House prices.esp [Version 1.0]76 RealisticFatigue.esp77 RealSleepExtended.esp [Version 2.5]78 SupremeMagicka.esp [Version 0.89]79 SM_ShiveringIsles.esp [Version 0.86]++ SM_DLCSpellTome.esp [Version 0.80]++ SM_OOO.esp [Version 0.89]++ SM_MMM.esp [Version 0.89]++ SM_COBL.esp [Version 0.86]7A SM_EnchantStaff.esp [Version 0.80]++ SM_UnlockSpells.esp [Version 0.70]++ SM_Scrolls.esp [Version 0.84]++ SM_SigilStone.esp [Version 0.83]7B SM Bounty.esp [Version 1.22c]++ CoblDeathFix.esp [Version 1.20]7C Duke Patricks - Combat Archery.esp [Version 3.6]7D Duke Patricks - Actors Can Miss Now.esp7E nGCD.esp7F nGCD Oghma Infinium.esp++ nGCD Skeleton Key.esp80 ProgressArmorer.esp [Version 1.0]** Let There Be Darkness - Cyrodiil + SI.esp** Let There Be Darkness - Knights.esp** Let There Be Darkness - Mehrunes Razor.esp** Let There Be Darkness - Thieves Den.esp** Let There Be Darkness - OOO.esp** Let There Be Darkness - Kvatch Rebuilt.esp** Let There Be Darkness - Lost Spires.esp** Let There Be Darkness - UL Colovian Highlands.esp** Let There Be Darkness - UL Lost Coast.esp** Let There Be Darkness - UL Brena.esp** Let There Be Darkness - UL Blackwood Forest.esp++ Item interchange - Placement.esp [Version 0.78]++ Item interchange - Placement for Frostcrag Reborn.esp [Version 0.78]81 Cobl Races.esp [Version 1.52]++ Cobl Races - Balanced.esp [Version 1.52]82 Better Cities Full.esp [Version 4.8.3]83 Better Cities - Unique Landscape Barrowfields.esp [Version 4.7.0]84 Better Cities - Unique Landscape Chorrol Hinterland.esp [Version 4.7.0]85 Better Cities - Unique Landscape Cheydinhal Falls.esp [Version 4.8.1]86 Better Cities - Unique Landscape Skingrad Outskirts.esp [Version 4.8.1]87 Better Imperial City.esp [Version 4.8.1]88 Better Imperial City FPS Patch.esp [Version 4.8.1]89 Better Cities - COBL.esp [Version 2.1]8A Better Cities - Unique Landscape Imperial Isle.esp [Version 4.8.1]8B Better Cities Full FPS Patch.esp [Version 4.8.1]8C Real Hunger, Cobl.esp [Version 1.6.1]** NRB4 Standard Road Record.esp++ Cobl Filter Late MERGE ONLY.esp [Version 1.53]** All Natural - Indoor Weather Filter For Mods.esp [Version 1.1]8D Bashed Patch, 0.esp8E MergedMaps.esp8F Oblivion Graphics Extender Support.esp [Version 0.41]90 Streamline 3.1.esp
EDIT: New test, would installing a different mod (Arthmoor's Molapi) cause the same problem? Answer: no. I'm pretty convinced now that this problem is not being caused by me.