Texture problem with addons

Recently I installed two scenery addons, one is Buenos Aires Ezeiza Airport and the other a Rio de Janeiro environment upgrade, and in both cases the addon surface perimeter looks blank, with no texture at all, including the objects.- In the Rio de Janeiro addon, only the default objects emerge from the blank surface, and in Ezeiza, only the runways.- In the instructions there are no reference about using generic texture libraries, which should be previously installed, so I cannot found the problem.- Other scenery addons had been installed OK, and in general, FS9 works perfect.-Maybe somebody can help me.- Thanks