Thanks for interesting in my problem : )
I tried to do what you said, but :
1 -i delete WTF and patch.
2- repair window didn't have any button, also if BackgroundDownloader and Launcher are closed .
3- i don't know if it is normal but if i run Launcher, another WTF folder is created.
I think that the problem was originated by AddOnStudio for 1 reason :
The files that appare in interface folder are the same that appared when i installed AddOnStudio
i think the problem are this files, that are not compatible with patch 4
But i can do nothing to avoid this files appear.
Mine are only noobs opinion, but i can't play : (
Everythink is ok, until i choose one of my char, and play.
Than appear this folders, in interface folder with 1 ".pub" file each inside with the same name :
Blizzard_AchievementUI, Blizzard_ArchaeologyUI, Blizzard_ArenaUI, Blizzard_AuctionUI, Blizzard_BarbershopUI, Blizzard_BattlefieldMinimap
Blizzard_BindingUI, Blizzard_Calendar, Blizzard_CombatLog, Blizzard_CombatText, Blizzard_CompactRaidFrames, Blizzard_DebugTools,
Blizzard_GlyphUI, Blizzard_GMChatUI, Blizzard_GMSurveyUI, Blizzard_GuildBankUI, Blizzard_GuildControlUI, Blizzard_GuildUI, Blizzard_InspectUI,
Blizzard_ItemSocketingUI, Blizzard_MacroUI, Blizzard_RaidUI, Blizzard_ReforgingUI, Blizzard_TalentUI, Blizzard_TimeManager, Blizzard_TokenUI