This bug also occours with option --version $ export DISPLAY=mymachine:0.0 $ glade-2 --version GTK Accessibility Module initialized Glade (GTK+) 2.6.8 $ export DISPLAY=unknown:0.0 $ glade-2 --version _X11TransSocketINETConnect: Can't get address for unknown (glade-2:6959): Gtk-WARNING **: cannot open display: