I can confirm Captive's assertion, the classic model packs where never designed for use in Reloaded, which has slowly become a total re-write of the original FPS Classic product. We will be releasing Reloaded specific model packs in 2014 which take advantage of the new shaders, higher texture quality, normal and specular maps, advanced LOD and render settings. We have some limited support in place for legacy models, but this support is on a trial-by-fire method and your mileage may vary. Also note that the ten model packs currently bundled with the Gold pledge are NOT compatible with FPSC Reloaded, and are intended for the Classic version of the product.
Hogging the awesome since 1999