According to Cartoon Brew, Lasseter pulled Glen Keane off his directorial duties on Rapunzel because Keane is dealing with health issues.
Here's the story: http://www.cartoonbrew.com/disney/rumor-central-lasseter-not-keane-on-rapunzel
Glen Keane Off Rapunzel
By Jabberwocky | Saturday, October 11, 2008 at 3:53am
#1
Glen Keane Off Rapunzel