FC6 and adding a new route with system-config-network

[Bengt Lindholm]

System-config-network does not work when I try to add a new route:

Component: system-config-network
Version: 1.3.95
Summary: TB94e1a8fa sharedtcpip.py:176:route_update:TypeError: sequence
item not a string or unicode object

Traceback (most recent call last):
  File "/usr/share/system-config-network/netconfpkg/gui/sharedtcpip.py",
line 284, in on_routeAddButton_clicked
    route_update(xml, device)
  File "/usr/share/system-config-network/netconfpkg/gui/sharedtcpip.py",
line 176, in route_update
    clist.append([route.Address, route.Netmask, route.Gateway])
TypeError: sequence item not a string or unicode object

If I use "route add -net", the new route does not survive booting.
Editing rc.local for this purpose is not very nice. What to do?

Bengt