The only animation I'm seeing with version 1.5.1 of this mod (Forge 1448, AnimationAPI 1.2.4) is breathing when player is stationary. Walking/running, crawling, jumping - everything is still vanilla. Player model doesn't have joints either. It loads though! For this I am grateful, at least. As much as I like Mo' Bends (another mod similar to this one) it has some performance issues and doesn't seem to be updated for 1.7 anymore.
Thanks for the quick reply. Can you give me any more information about your game? Do you have any other mods installed?