Hi gang! Not sure if it is a bug, but check this PG.
Looks ok.
Now activate line 8 and de-activate line 9.
Mesh disappears.
Bug? Normal?
I think it needs fixing/adjusting. It seems common for coders to place camera directly above target.
This feels like an 'epsilon' thing, again. 
It has been an epsilon-ish summer, so far, for Mister Wingnut. heh