Ed - I don't have any Orbx scenery specific to that area. I do have their global products, but I don't believe they contain any mesh files.
I do have FreeMeshX but disabling that makes no difference.
Many sceneries do come with an additional elevation .bgl that somehow re-enforces any elevation over-ride issue and sits in the Scenery/World/scenery folder.
(although I have no idea how they actually work!)
Might that be something worth looking at?
A.
ps. and then there's still the mystery of the missing texture...could that be a texture file not present in P3Dv2.5 and, according to stansdds post,
FSX Acceleration ? Weird thing is, the object is there ...along with some of its texturing.