I am sorry for breaking into this thread, but I sort of have the same problem. Except - mine involves the quests that have the "?" in the Quest Watch Window. Normal quests work normally. When I click the "?" in the Quest Watch, I get the normal quest window but when I click the button to advance the quest, it auto-accepts the next part of the quest and I never even get to read what I have to do. I am listing my AddOn's here. (Sorry, it's a big list.)
Code:
!!Warmup
!BugGrabber
!ClassColors
!CooldownFader
!Swatter
Ace3
AckisRecipeList
AckisRecipeList_Alchemy
AckisRecipeList_Blacksmithing
AckisRecipeList_Cooking
AckisRecipeList_Enchanting
AckisRecipeList_Engineering
AckisRecipeList_Inscription
AckisRecipeList_Jewelcrafting
AckisRecipeList_Leatherworking
AckisRecipeList_Smelting
AckisRecipeList_Tailoring
AddonLoader
Align
Altoholic
Altoholic_Achievements
Altoholic_Agenda
Altoholic_Characters
Altoholic_Grids
Altoholic_Guild
Altoholic_Search
Altoholic_Summary
Archy
Auc-Advanced
Auc-Filter-Basic
Auc-ScanData
Auc-Stat-Histogram
Auc-Stat-iLevel
Auc-Stat-Purchased
Auc-Stat-Simple
Auc-Stat-StdDev
AuctionLite
Auc-Util-BigPicture
Auc-Util-FixAH
AutoRepair_
BadBoy
BadBoy_CCleaner
BadBoy_Guilded
BadBoy_History
BagBrother
Bagnon
Bagnon_Config
Bagnon_Facade
Bagnon_GuildBank
Bagnon_VoidStorage
BeanCounter
Breakables
Broker_Align
Broker_Nameplates
Broker_TradeCooldowns
BugSack
ButtonForge
Carbonite
Carbonite.Info
Carbonite.Items
Carbonite.Notes
Carbonite.Quests
Carbonite.Social
Carbonite.Warehouse
Carbonite.Weekly
ChocolateBar
ChocolateBar_Options
CleanHotKey
C-old-carbonite-old
ColorPickerPlus
DataStore
DataStore_Achievements
DataStore_Agenda
DataStore_Auctions
DataStore_Characters
DataStore_Containers
DataStore_Crafts
DataStore_Currencies
DataStore_Garrisons
DataStore_Inventory
DataStore_Mails
DataStore_Pets
DataStore_Quests
DataStore_Reputations
DataStore_Spells
DataStore_Stats
DataStore_Talents
DLMS
Dominos
Dominos_Cast
Dominos_Config
Dominos_Encounter
Dominos_Roll
Dominos_XP
Doom_CooldownPulse
ElkBuffBars
Enchantrix
Enchantrix-Barker
EventNotifier
Factionizer
FB_Broker
FB_MergeDatabase
FB_OutfitDisplayFrame
FB_Titan
FB_TrackingFrame
FireExit
FishingBuddy
FloTotemBar
Flourish
FluidFrames
FlyPitch
FuBar_FishingBuddyFu
GalvinUnitBars
GatherMate2
GatherMate2_Data
GatherMate2_Data_Carbonite
Grid
GrizzlySharedMedia_
GuildRosterButtons
HealthWarning
iLib
InFlight
InFlight_Load
Informant
iSold
iTracking
JamPlates Accessories
kgArt
kgBorders
kgBut
kgPanels
kgPanelsConfig
LearningAid
LibBabble-Zone-3.0
LibDBIcon-1.0
LibNameplate-1.0
LibPeriodicTable-3.1
LibSharedMedia-3.0
LightHeaded
LightHeaded_Data_A
LightHeaded_Data_B
LightHeaded_Data_C
LightHeaded_Data_D
LightHeaded_Data_E
LightHeaded_Data_NPC
LightHeaded_Data_QIDDesc
LightHeaded_Data_QIDNames
LineemUp
Mapster
Masque
Masque_ClassButtons
Masque_Dark
Mendeleev
MicroDeclineDuel
MinimapButtonFrame
MinimapButtonFrame_sClassButtons
MinimapButtonFrame_sDark
MinimapButtonFrame_SkinPack
Misspelled
MoveAnything
MySales
nanoplayed
New Folder
nibChatTabs
nibHideBlackBar
nibPointDisplay
No Glow in Bags
Notifications
oGlow
OmniCC
OmniCC_Config
OpenAll
Outliner
PetBattleTeams
PhanxChat
PitBull4
PitBull4_Aggro
PitBull4_AltPowerBar
PitBull4_Aura
PitBull4_Background
PitBull4_BattlePet
PitBull4_BlankSpace
PitBull4_Border
PitBull4_BurningEmbers
PitBull4_CastBar
PitBull4_CastBarLatency
PitBull4_Chi
PitBull4_CombatFader
PitBull4_CombatIcon
PitBull4_CombatText
PitBull4_ComboPoints
PitBull4_DemonicFury
PitBull4_DogTagTexts
PitBull4_DruidManaBar
PitBull4_Eclipse
PitBull4_ExperienceBar
PitBull4_HealthBar
PitBull4_HideBlizzard
PitBull4_Highlight
PitBull4_HolyPower
PitBull4_HostilityFader
PitBull4_LeaderIcon
PitBull4_LuaTexts
PitBull4_MasterLooterIcon
PitBull4_PhaseIcon
PitBull4_Portrait
PitBull4_PowerBar
PitBull4_PvPIcon
PitBull4_QuestIcon
PitBull4_RaidTargetIcon
PitBull4_RangeFader
PitBull4_ReadyCheckIcon
PitBull4_ReputationBar
PitBull4_RestIcon
PitBull4_RoleIcon
PitBull4_Runes
PitBull4_ShadowOrbs
PitBull4_SoulShards
PitBull4_Sounds
PitBull4_ThreatBar
PitBull4_Totems
PitBull4_VisualHeal
PitBull4_VoiceIcon
Portfolio
Quartz
QuestReward
ReadySetDing
Recipe Helper
Scrap
Scrap_Merchant
Scrap_Options
Scrap_Spotlight
Scrap_Visualizer
ScrollingPetBattleText
SharedMedia
SharedMedia_MyMedia
SharedMedia_NoAsianFonts
SharedMediaAdditionalFonts
SharedMedia-Blizzard
ShieldsUp
ShinyStats
SimpleRunesBar_
SLDataText
SLDataText_CombatMonitor
SLDataText_Friends_
SLDataText_Guild_
SLDataText_StatLine
SlideBar
SpeedyLoad
SPTimers
SPTimersSpellCache
Stubby
SwindlerPreventer
TidyPlates
TidyPlates_Graphite
TidyPlates_Grey
TidyPlates_Neon
TidyPlates_Quatre
TidyPlatesHub
TidyPlatesWidgets
Tipsy
TipTac
TipTacItemRef
TipTacOptions
TipTacTalents
tullaRange
tullaRange_Config
VisualBindings
WoWDBProfiler
xanTooltipHoudini
XLoot
XLoot_Frame
XLoot_Group
XLoot_Master
XLoot_Monitor
XLoot_Options
ZMobDB
ZoneAchievementTracker
Not all addon's are active on all characters but I have the problem on all characters.