A number of teachers weighed in on the disapperance of Tiger Woods' chipping yips/debated whether they were ever there in the first place. I like James Sieckmann's take the best. 

“Imagine if you’ve been amazing at something your whole life, and you never had to think about how to do it. Then all of a sudden, when you tried to do it, it didn’t work. Tiger was thinking the same things he always had, but he didn’t get the same result. He was confused. His setup had gotten so different, with his head behind the ball and his shoulders closed. He was in a position where he couldn’t hit the ball first. A lot of people think he had the yips. He didn’t. Tiger had a bad motor pattern. And when he found the right pattern again, it came back quickly—and so did his confidence.”