Why I can't keyframe position of hips bone? When i move hips bone and keyframe it, its position does not interpolate, but it stays in the same position. However, rotation on leg bones (caused by IK chain when moving hips) is keyframing properly.
Here is my .blend file: BLEND FILE

I've set the keyset to LocRot, so it should be ok. Any ideas?

( The problem came up from troubleshooting THIS one )
Place two keyframes on different frames for interpolation.