Running RTR Platinum 1.9 with retail Rome TW (not gold or platinum) 1.5, got this message today when I entered a battle:

failed to find texture data/RTR/models_unit/texture/wspite_horse_heavy_crest_mockup.tga

Any reason why I wouldn't have this texture? Seems kind of unique because I did a google search and it only yielded one website but it was in Russian.