Code:
/run for i, v in pairs({ PlayerTalentFrameTopBorder, PlayerTalentFrameRightBorder,PlayerTalentFrameLeftBorder,PlayerTalentFrameBottomBorder,PlayerTalentFrameBtnCornerLeft,PlayerTalentFrameBtnCornerRight }) do v:SetVertexColor(1, 0, 0) end
Maybe you're setting the colour too early and it's being changed back.