Not even sure where to put this, but.
in windower4\res\weapon_skills.lua Dimidiation has no SC properties.
I corrected this once in my copy of the files, but it seems to have been overwritten last time windower updated.Code:[61] = {id=61,en="Dimidiation",ja="デミディエーション",element=6,icon_id=602,prefix="/weaponskill",range=2,targets=32},