Download and install either the latest Stand-Alone Addon Manager, or reinstall the scenery. In both cases, be sure you reply YES to the question to update the scenery AFCAD.
The problem wasn't the scenery or a missing texture, but a difference (bug ?) in rendering priorities between the scenery objects and the AFCAD that has been introduced in one of the latest 2.x P3D patches (FSX is fine), so we updated the AFCAD accordingly to bypass the problem.