Bone (Armature) ghosting problem There is a problem with armature ghosting. It's not shown in viewport.
Onion skins are work fine. Motion path works with geometry, but doesn't work with bones.. 
What can it be? a Bug? Nvidia driver problem? Am I missed something? Some addon blocks it?
motion paths work like this. Although for some reason in this example head and tails were switched by machine. could be bug.