The problem is obviously either just the specific models you are using or your code. I'ld have to see the models directly in order to know which to load and play. Meanwhile since you haven't posted the code you are using to play the animation it is entirely possible you are simply using the Animate command incorrectly. The most common mistake I see is to call Animate every frame; the command is designed to only be called once when you start playing an animation and then use UpdateWorld every frame to increment playback.