Late import twisted's reactor, it allows the gtk reactor to be proper installed.

deluge/config.py

@@ -72,7 +72,6 @@ import logging
 import shutil
 import os
 
-from twisted.internet import reactor
 import deluge.common
 
 json = deluge.common.json
@@ -220,6 +219,7 @@ what is currently in the config and it could not convert the value
 
         self.__config[key] = value
         # Run the set_function for this key if any
+        from twisted.internet import reactor
         try:
             for func in self.__set_functions[key]:
                 reactor.callLater(0, func, key, value)
@@ -288,6 +288,7 @@ what is currently in the config and it could not convert the value
         """
         del self.__config[key]
         # We set the save_timer for 5 seconds if not already set
+        from twisted.internet import reactor
         if not self._save_timer or not self._save_timer.active():
             self._save_timer = reactor.callLater(5, self.save)