Index: deluge/ui/gtkui/signals.py
===================================================================
--- deluge/ui/gtkui/signals.py  (revision 2020)
+++ deluge/ui/gtkui/signals.py  (working copy)
@@ -50,6 +50,10 @@
         self.receiver.connect_to_signal("torrent_all_resumed",
             self.torrent_all_resumed)

+    def __del__(self):
+        self.receiver.stop()
+        del self.receiver
+
     def torrent_added_signal(self, torrent_id):
         log.debug("torrent_added signal received..")
         log.debug("torrent id: %s", torrent_id)
Index: deluge/ui/signalreceiver.py
===================================================================
--- deluge/ui/signalreceiver.py (revision 2020)
+++ deluge/ui/signalreceiver.py (working copy)
@@ -68,6 +68,9 @@
         # FIXME: send actual URI not localhost
         core = xmlrpclib.ServerProxy(core_uri)
         core.register_client("http://localhost:" + str(port))
+
+    def __del__(self):
+        self.unregister_function(self.emit_signal)

     def run(self):
         """This gets called when we start the thread"""
Index: deluge/SimpleXMLRPCServer.py
===================================================================
--- deluge/SimpleXMLRPCServer.py    (revision 2020)
+++ deluge/SimpleXMLRPCServer.py    (working copy)
@@ -216,6 +216,11 @@
             name = function.__name__
         self.funcs[name] = function

+    def unregister_function(self, function):
+        for name in self.funcs:
+            if function in self.funcs[name]:
+                self.funcs[name].remove(function)
+
     def register_introspection_functions(self):
         """Registers the XML-RPC introspection methods in the system
         namespace.