Added a warning message, if you use MATPLOTLIB you will have to deactivate threading or the window will not be shown.

IPython/gui/wx/wxIPython.py

@@ -87,6 +87,7 b' class MyFrame(wx.Frame):'
         warn_text = 'Hello from IPython and wxPython.\n'
         warn_text +='Please Note that this work is still EXPERIMENTAL\n'
         warn_text +='It does NOT emulate currently all the IPython functions.\n'
+        warn_text +="\nIf you use MATPLOTLIB with show() you'll need to deactivate the THREADING option.\n"
         
         dlg = wx.MessageDialog(self,
                                warn_text,