Thanks to The Curt Jester for this one:

Today the U.S. bishops withdrew the review of the film “The Golden Compass,” which opened in theaters in the United States Dec. 7. The review was written by Harry Forbes and John Mulderig, the director and staff reviewer respectively of the Office for Film and Broadcasting of the U.S. Conference of Catholic Bishops. The review was released and posted on the CNS Web site Nov. 29. The USCCB gave no reason for withdrawing the review.

I think we can figure this one out–no explanation necessary.