When clicking the "ping" tab, the application clsoes

[Les Pounder]

Binary package hint: gnome-nettool

When i click on the "Ping" tab, the nettool application windows closes, there are no error messages and the error persists after a restart.
Ubuntu Lucid Lynx 10.04 Beta 1
Gnome-nettool 2.30.0-0ubuntu1 (lucid)

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: gnome-nettool 2.30.0-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
Uname: Linux 2.6.32-19-generic x86_64
Architecture: amd64
CheckboxSubmission: 1c9290b455bded94812accd1dd79ba5d
CheckboxSystem: d00f84de8a555815fa1c4660280da308
Date: Sat Apr 10 20:15:36 2010
ExecutablePath: /usr/bin/gnome-nettool
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta amd64 (20100318)
ProcEnviron:
 LANG=en_GB.utf8
 SHELL=/bin/bash
SourcePackage: gnome-nettool
XsessionErrors:
 (polkit-gnome-authentication-agent-1:1323): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (dropbox:1329): Gdk-CRITICAL **: gdk_window_thaw_toplevel_updates_libgtk_only: assertion `private->update_and_descendants_freeze_count > 0' failed
 (gnome-terminal:2049): Gtk-CRITICAL **: gtk_accel_map_unlock_path: assertion `entry != NULL && entry->lock_count > 0' failed
 (gnome-terminal:2810): Gtk-CRITICAL **: gtk_accel_map_unlock_path: assertion `entry != NULL && entry->lock_count > 0' failed

[Johannes (o-launchpad-spam-slzm-de)]

Same bug for me in an updated Karmic install as well as a Lucid (installed Alpha 3 and updated to Beta 2 in one step).