Landmarks in the sky

I am building in the sky above my land. If I create a landmark to return, the landmark will take me to the coordinates but I end up on the ground. Never up. I can use other landmarks in the sky, and other people can use landmarks to my house in the sky but for some reason they do not work for me. I am currently using Emerald Viewer but the problem existed long before I switched.

Help?

Does the parcel have a Landing Point set (in About Land)?

"Bluebird, flying high
Tell me what you sing
If you could talk to me
What news would you bring
Of voices in the sky

Nightingale, hovering high
Harmonize the wind
Darkness, your symphony
I can hear you sing
Of voices in the sky

Just what is happening to me
I lie awake with the
sound of the sea
Calling to me"

-- The Moody Blues