diff -Nuar virt-manager-0.7.0.orig//src/virtManager/addhardware.py virt-manager-0.7.0//src/virtManager/addhardware.py
--- virt-manager-0.7.0.orig//src/virtManager/addhardware.py	2009-04-21 14:53:08.000000000 -0600
+++ virt-manager-0.7.0//src/virtManager/addhardware.py	2009-04-21 14:56:20.000000000 -0600
@@ -481,7 +481,10 @@
                 net = self.get_config_network()
                 if net[0] == "bridge":
                     self.window.get_widget("summary-net-type").set_text(_("Shared physical device"))
-                    self.window.get_widget("summary-net-target").set_text(net[1])
+                    if net[1] != None:
+                        self.window.get_widget("summary-net-target").set_text(net[1])
+                    else:
+                        self.window.get_widget("summary-net-target").set_text(_("Default"))
                 elif net[0] == "network":
                     self.window.get_widget("summary-net-type").set_text(_("Virtual network"))
                     self.window.get_widget("summary-net-target").set_text(net[1])