[Spinner]

I find a show locked objects in 3D window setting in the 3D drop down menu at the top of screen. I also find a show locked object in 3D window checkbox in the Visability box, bottom left of screen.
These two settings dont seem to be interlinked.
I find that whether they're both turned on or off, or one on and the other off (either way) that if I select an object, and lock it, it immediatly vanishes from the 3D window.
Locked object display settings seem to work correctly and intuitivly in the orthographic windows.
Can anyone shed any light on where I'm mis-understanding how this functions in 3D window?
Thanks,
Spinner