I posted a similar thought in another thread on the "other" board.

If you look back when Tiger was winning on a very routine basis, he was always SMILING(with the stalking look on his face)...in other words having fun. I pointed it out during The Master's that the look on his face was more of one who is simply going through the motions. He needs to get back to playing for fun...after all winning is the ultimate in fun.

Also, his swing looks pretty good...on plane. At the last second though, his left shoulder is coming up and out which is giving him all of the blocked shots. I think swingezy is absolutely correct in that he is simply overswinging and trying to HIT the ball instead of making a smooth swing THROUGH the ball.