I’m still sensing in many organizations what I can only describe as fear:  Leaders who are afraid to allow their staff members to get to know them; subordinates who are afraid to ask questions when their leader has made a questionable decision; people who are afraid to try new things.
On your gemba walks, you should work hard to be positive and encourage people.  Perhaps if you are truly able to encourage them, they will muster the COURAGE to overcome some of these fears.  By the way, if you’re not talking to people, you’re not on a gemba walk.