You're standing in front of the class. The training you're giving is going fantastic...it is your favorite subject and you can easily talk about this for hours on end.
After the course your students fill in a survey about how well they like your course and the reactions aren't that great. What's going on?
You are coaching a junior employee. You point out where he could improve in and what easy steps he can take to become better at it. Yet, after several sessions nothing seems to change. What's going on?