Python-gobject 3.0.3-2 here and I’m able to reproduce this. I haven’t got an exact recipe for it, but enough wiggling around in software sources (with the mirror and such) seems to bring it on. I *think* it happens only when I finally close the window and not before. I’ll keep looking for the exact steps, but I’m pretty confident this is still unfixed, as apport always points me to this report.