On Windows, I was having a problem with my wxreactor application intermittently freezing on initialization. It was also taking a long time to exit. wxdemo.py doesn't exhibit the problem at startup, most likely due to the simplicity of the GUI. The demo does however exhibit the exit problem. What I did to alleviate both problems was to move the timer creation and starting code: class MoMWorldServer(wx.App): def OnInit(self): #SNIP wx.EVT_IDLE(self,self.OnFirstIdle) def OnFirstIdle(self,evt): #We catch the first idle message and use it to kick start #the twisted reactor, this avoids a possible deadlock, at least on Windows, gulp print "Starting Network Service" wx.EVT_IDLE(self,None) #remove handler #create the timer and start it reactor.timer = wxreactor.ReactorTimer(reactor) reactor.timer.Start(1) For the exiting problem, I stop the timer on the close event to the main frame of the application: class MainFrame(wx.Frame): def __init__(self, parent, id, title): #SNIP wx.EVT_CLOSE(self,self.OnClose) def OnClose(self,evt): evt.Skip() #stop the timer here reactor.timer.Stop() -Josh Ritter Technical Director http://www.prairiegames.com