I found another neat rigged character in the test240.zip regression file,
in the 'animations' sub folder with the unlikley file name of 'controller2.blend'
For some reason, after either keying the armature or the facial controls, the facial controls stop working. I haven't traced down the exact sequence of operations leading to the error ... will try to do so.
Bug ? (blender 2.41) .... or more likely operator error