I am having the problem with it not quitting. I am on Mac OS X 10.6.4 But also I have had problems with two iso files, where when I try to download them all my other torrents slow WAY DOWN. Not because that torrent is going either, it is going slow too. I go from 300kb/s down 200kb/s up to like 5kb/s down and 1kb/s up. They were on 2 different torrent sites too. Confused....