loading animation problem.

I am trying to test animation in D3D test program. before I make the test program, I am downloaded some sample code( Load X file with hierarchy) for make sure loading 3d model files and loading animations. Problem is, 3D model file is well loaded. but biped animation doesn't work. (Auto key frame animation is work fine (ie : rotating models, moving models)) I am using 'biped' and 'physique modifier' and make the motion using 'Auto Key Frame function'. What did I miss it? oh, I'm also using kW exporter plugin.