"Body up/down motion" not working

[OpsTao]

I have a rigged character with Walk Cycle applied. Legs animate and walk speed responds to changes applied in Walk Cycle settings. However the body up/down motion doesn't respond, regardless of setting. Body seems to be pinned at its After Effects center point. What might cause this?

[Duduf]

Difficult to say without seeing the timeline and how/if the body is correctly connected to the walk cycle.