In message <Pine.LNX.4.64.0803082311530.21164 at grozny.maths.univ-evry.fr> you wrote: > in ecore_xcb, I have something strange: when I get any event in my event > loop, xcb_poll_for_event() returns an event with response_type being 0. > > What does it mean ? Is it a specific error ? I don't quite understand what you are seeing here? Bart