This should fix one-to-one chat, can't test now though

activities/chat/ChatActivity.py

@@ -50,15 +50,7 @@ class ChatShellDbusService(dbus.service.Object):
 	def open_chat(self, serialized_service):
 		self._parent.open_chat(Service.deserialize(serialized_service))
 
-class ChatShell:
-	instance = None
-
-	def get_instance():
-		if not ChatShell.instance:
-			ChatShell.instance = ChatShell()
-		return ChatShell.instance		
-	get_instance = staticmethod(get_instance)
-
+class ChatListener:
 	def __init__(self):
 		ChatShellDbusService(self)
 
@@ -104,7 +96,6 @@ class ChatShell:
 		chat.connect_to_shell()
 		return False
 
-chat_shell = ChatShell.get_instance()
-chat_shell.start()
-
-gtk.main()
+def start():
+	chat_listener = ChatListener()
+	chat_listener.start()

sugar/activity/Activity.py

@@ -42,6 +42,15 @@ class ActivityFactory(dbus.service.Object):
 		
 		(fp, pathname, description) = imp.find_module(module_name)
 		module = imp.load_module(module_name, fp, pathname, description)
+		
+		try:
+			start = getattr(module, 'start')
+		except:
+			start = None
+
+		if start:
+			start()
+		
 		self._class = getattr(module, class_name)
 	
 		bus = dbus.SessionBus()