Deluge
So I'm using 1.1.0 on my Ubuntu 8.10 machine as usual today and I tried to add several torrents at once. Unfortunately I added one torrent twice and tried to remove it. I get the UI to display me the "add" dialog (not the add to session but "where to store" one) and when I remove one of the torrents via the "Remove" button and then click on another one of the items in the list the UI just segfaults and dies. The daemon keeps running unaffected. Since I don't know how to produce shell output from the GUI alone I can't help with any dumps. I can reproduce this 100% of the time right now.
I didn't know if I should have created a bug ticket for this kind of stuff so I did in addition to this. Maybe you can tell me what I'd rather do of the two in the future write in the forums or create bug tickets. There are some really old tickets still active and you guys write here very regularly so I couldn't decide.
Anyhow, I really enjoy using the new version and if it goes on like this you sure will stay my torrent solution (and the only one after I can finally create torrents again).