Ever since I downloaded this pretty amazing mod, none of my cavalry units, or the enemies have horses, or the equivelant animal the unit should use.

At first I expected it to be related to weather conditions (snow), but then quickly realised it had spread to any battlefield I played on. None of my cavalry units seem to use horses at all, and simply act as they would dismounted. The horses, remain nowhere to be seen at all. The unit spawning in as any other infantry unit.