Red X shows only after moving the head with the move tool or Get Position button is pressed.
If I press Home it doesn’t update the head position until I push the Get Position button.
After a Frame the head returns to home. After a Cut the head returns to Orgin (set on control pad) Red X stays at whatever position it was last moved to or Get Position determined it.
So I am not sure if I know how this works and it seem slightly irregular.