If you are flying an A320 without the pop up flight directors and you have been doing a visual appproach using the bird, it should be killed shortly after GA commencement, it can easily cause confusion. You then switch both flight directors on, they will engage in hdg v/s, pull the thrust levers momentarily out of the TOGA gate and reengage them into the TOGA gate, hey presto you will see TOGA SRS GA TRACK!!!