The easiest place for the full story is the andante.com website under the news archive. In short, the musicians union accused Dutoit of being abusive (and other things) in a public statement. That statement was issued while he was out of town. He immediately resigned and would not reconsider despite some back pedaling on the part of the musicians. This has caused quite a stir in the arts management world and has been extensively reported on by the speciality arts news sources and the Montreal papers (also available on the web).