Deluge won't start anymore. What do I do?
Sometimes, the configuration files might get corrupted. In Linux, you can fix this by typing `rm ~/.config/deluge/persistent.state` in a command prompt. In Windows, you can fix this by deleting C:\Documents and Settings[User Name]\Deluge\persistent.state. This will remove all of your torrents, but don't freak out; you can reload them and Deluge will continue from where it left off. By default the torrent files are saved to ~/.config/deluge/torrentfiles/ in Linux and C:\Documents and Settings[User Name]\Deluge\torrentfiles\ in Windows.
Je lis ça sur la FAQ de deluge-torrent.org. Essaie de supprimer le fichier indiqué (persistent.state) d'abord puis réessaie de lancer l'application.