Many times when I try to use the Thu'um it becomes bugged. I do not have the option of using any shouts. The shouts in my favorites menu are missing while the bug is active. I know of a quick fix which is to cast any spell, but this becomes frustrating after a while. Half the time I try to shout I end up having to select a spell and use it then switch back to whatever weapon I was using. Does anyone know of a perminant fix for this?