I still have this bug described by Lightbringer23, however i can't fix it. I just installed this mod (ver. 4.2.4) on modless BG:EE and for me this bug still appear. Here's my weidu log:
// Log of Currently Installed WeiDU Mods
// The top of the file is the 'oldest' mod
// ~TP2_File~ #language_number #component_number // [Subcomponent Name -> ] Component Name [ : Version]
~THALAN/THALAN.TP2~ #6 #0 // Thalantyr - Item Upgrade: v4.2.4
Like Lightbringer23 said, dialogue option appears in the dialogue tree under "rumors", which disappear after first talk. Can't find THALAN.dlg file, only THANAL.d but there is no "RumorTalkThalan". "Global("RumorTalkThalan","GLOBAL",1" appears only in thalan.tp2 file, but changing it for 0 doesn't change anything.
Etamin, Lightbringer spoke about changing thing in the game, not the mod.
You can also set per cheat console:
C:SetGlobal("RumorTalkThalan","GLOBAL",0)
every time before you talk to Thalantyr in the game.