Left of the Height value box up in the camera properties, there is a padlock (right?) inside a yellow box. Click it, and the padlock should now be gray and not inside a yellow box. The "fixed-distance-from-objects-below" lock is now off. Generally, I work with this OFF all the time,except for when working close to bumpy mountains and displaced water. Other than that, I disable it as soon as I start working on my scene.

I think this counts for every Vue version with the camera lock built in...

Cheers,

Thomas / A-Spot