I have been using Blender and I have tried everything I can to get this fixed but no success. My animated object distorts badly and stretches out unnaturally. I have applied transforms, applied delta transforms, removed location keyframes and I only have rotation recorded in every keyframe. I still get the same erratic motion. I'm using FBX 7.4 binary export with Blender. The armature seems to have its bones parented as it really should be and I do not have the armature parented to the model(s). I do have the animation modifier on every LOD.