Just noticed this bug, not sure how long it's been active for me since I remember it being nonbuggy a looong time (and many mod changes) ago.

The various Ayleid weapons added in OOO have a scripted effect that adds 1/2/3/4 magicka regen/sec at night, while equipped. However, they're not working for any of my *current* chars. If I create a new character and additem a staff and equip it even in the starting cell, it works (game starts at 1am) and I get the 1mps buff. However, on all of my current chars (levels 17 through 33) no Ayleid weapon gives me any sort of buff at all. I can manually add the buff, and removing the weapon removes the buff, but no matter what time of day it is I never am given the buff (nor does the buff get removed automatically if I manually add it; only removing the weapon removes it).
I've checked the global variable "oooayleidregen", it's getting toggled (so the weapon's script is working), but I can't figure out any way to debug the quest that governs it while ingame (and obviously, it is working, just not in my saved games), other than doing startquest/getstage (no error messages returned, so the quest exists, but it doesn't have stages so getstage doesn't really help me.)

Any ideas? I noticed it because I just found one of the ayleid staves on a shopkeeper and I'd be very interested in buying it, as I'm playing an Atronoch spellcaster, so I could REALLY use the magicka regen (even if it's only at night).

Which OOO version are you running? Post your load order, preferably via Wrye Bash.

Are you sure the Ayleid weapons you are looking at are added by OOO? As far as I am aware, OOO doesn't add any of them to vendor lists, so they may be being added by another mod. One mod I know adds them is The Ayleid Steps, but I don't think that adds them to vendor lists either.

Eloise

Ungarion (Warlock's Luck) has an ayleid staff leveled list.

I'm not yet equipped with Bash (still downloading dependencies, I'm on Dialup now so......... could be a while)

Oblivion.esmAWS-Core.esmHelmetFOV.esmProgress.esmCM Partners.esmOscuro's_Oblivion_Overhaul.esmLandmarks, w Wells.espUnofficial Oblivion Patch.espxulAncientRedwoods.espxulAncientYews.espxulBeachesOfCyrodiilLostCoast.espxulChorrolHinterland.espxulColovianHighlands_EV.espxuldarkforest.espXulEntiusGorge.espULFallenLeafEverglade.espxulImperialIsle.espxulLushWoodlands.espxulStendarrValley.espxulRollingHills_EV.espxulTheHeath.espxulCloudtopMountains.espxulArriusCreek.espxulPatch_AY_AC.espOscuro's_Oblivion_Overhaul.espOOO-Water_Weeds.espIdentify Creature.espImmersiveWait.espExpanded Hotkeys and Spell Delete v1.0.espExpanded Hotkeys Brief Equip Message.espactors_in_charge.espCM Partners.espCM Partners NPC NE.espExpanded Hotkeys and Spell Delete manual.espDisenchant.espReznod_Mannequin_HD[Eng].espDecoratorAssistant with OBSE v1.11_Unofficial.espDLCHorseArmor.espSymphony of Violence.espSpeedy Disrobe OBSE.espPoison Maker v1.08.espStreamline 3.1.espArmamentariumKatanas.espDalls_Ninja.espDLCOrrery.espDLCFrostcrag.espDABeelzebub.espDLCVileLair.espDLCThievesDen.espDLCSpellTomes.espDLCMehrunesRazor.espKnights.espDungeon Actors Have Torches 1.6 DT.espRavenWearClothing.espDude Wheres My Horse.espApachii_Goddess_Store.espHelmetFOV-OBSE.espThieves Arsenal.espDLCBattlehornCastle.espReal Lava 1.3.espStealthOverhaul.espExterior Actors Have Torches 1.3 DT.espHGECUndiesHCup.espSyc_AtHomeAlchemy_No_Bounty_v2.espQQuix - Divine Elegance Showroom.espArynnsDrowWitchHGEC.espIce Gowns for HGEC.espProgressMBSP.espProgressSBSP.espFastShortcuts.espMidasSpells.espRefractionless Chameleon.espDunbarrrowStorage.espDAUltanAuroran.espWarlockSpellsTEST.espDark Dungeons.espTNR ALL RACES FINAL.espSupremeMagicka.espSM_Scrolls.espSM_SigilStone.espSM_DLCSpellTome.espSM_EnchantStaff.espSM_OOO.espMoveQuestItems - OBSE.espQuest Award Leveller.espQuest Award Leveller - Vile Lair.espQuest Award Leveller - Mehrunes Razor.espQuest Award Leveller - Knights of the Nine.espQuest Award Leveller - Battlehorn Castle.espRealisticForceMedium.espRealisticMagicForceMedium.espRealisticFatigue.espStockClothingArmor-forExnems.espSM Plugin Refurbish - HorseArmor.espSM Plugin Refurbish - Orrery.espSM Plugin Refurbish - FrostCrag.espSM Plugin Refurbish - VileLair.espSM Plugin Refurbish - ThievesDen.espSM Plugin Refurbish - MehrunesRazor.espSM Plugin Refurbish - Knights.espSM Plugin Refurbish - Battlehorn.espHarvest [Flora].espHarvest [Flora] - DLCVileLair.espHarvest [Flora] - DLCFrostcrag.espRealisticLeveling.espLiving Economy.espLiving Economy - Items.espCutthroat Merchants.esp

You should run BOSS on that load order as it seems a bit odd. Also, you need Wrye Bash/the Bashed Patch to run TNR with OOO. As it is now, TNR will override OOO's stats for NPC's, so you end up with vanilla stats for them.

Anyway, weird issue. Can't see what might cause it really. Does the magicka regen work if you load a save with only OOO?