I just dled build 364 and I have the opening problem too. Whenever I select Open (instead of downloading) the torrent from Firefox, it opens up in a new instance of utorrent. I have downgraded to 1.22 and I don't have the problem with that version. I then upgraded to 1.3.364 again and the problem comes back. Other than that, it's awesome. I just wish that whenever I open a new torrent, a window would pop out that allows me to select which files I want to download from the torrent. It'll be really convenient. Keep up the great job though.