I confirm that none of our sceneries (except JFK, which is why JFK is listed as DX10 compatible on the Web site ) works properly in DX10 mode.
What actually happens, is not always the same, because it depends *where* the scenery is located, and by the fact that not all our sceneries use the same method to render the ground.
None of them will work properly at night in DX10, for example.