Hi everyone, I have a problem with a modal dialog blocking wxreactor. If ShowDialog () is called from within a deferred callback which has been started by reactor.callLater everything twisted comes to a halt and continues only after the modal dialog has been closed. The sample script below should demonstrate the problem. I'm using twisted 2.2 for python2.4. Help! and thanks in advance Simon import sys, os from twisted.internet import wxreactor wxreactor.install () from twisted.internet import reactor, defer import wx class Frame (wx.Frame): def __init__ (self, parent, id, title): wx.Frame.__init__ (self, parent, id, title) btn_dlg = wx.Button (self, -1, "Press", size=(240, 180)) btn_dlg.Bind (wx.EVT_BUTTON, self.click) def click (self, event): d = defer.Deferred () self.prepare (d) def prepare (self, d): """ uncomment reactor.callLater or d.callback to test """ d.addCallback (self.show) reactor.callLater (1.0, d.callback, 1) # this will fail #d.callback (1) # this will work def show (self, val): for i in range (20): reactor.callLater (i*0.2, self.dosth, i) # these will be printed _after_ dialog has been closed dlg = wx.MessageDialog (self, "I am a dialog", "Dialog", style=wx.OK|wx.CANCEL) ruckgabe = dlg.ShowModal () dlg.Destroy () if ruckgabe == wx.ID_OK: print "okay" else: print "not okay" def dosth (self, idx): print "doing something nr", idx class App (wx.App): def OnInit (self): self.frame = Frame (None, -1, "Test") self.frame.Show (1) self.SetTopWindow (self.frame) return True if __name__ == "__main__": app = App () reactor.registerWxApp (app) reactor.run ()