Is this still happening on Fedora 16 with the latest wicd update?

Yes : latest is  wicd-gtk-1.7.0-9.fc16.noarch but file netentry.py not modified => same problem . Herafter a segmentation fault in the D-bus side of the programm:

[ath@mobilix ~]$ /usr/bin/python -O /usr/share/wicd/gtk/wicd-client.py
Has notifications support True
Loading...
Connecting to daemon...
Connected.
displaytray True
Done loading.
/usr/share/wicd/gtk/wicd-client.py:1028: GtkWarning: IA__gdk_window_get_root_coords: assertion `GDK_IS_WINDOW (window)' failed
  mainloop.run()
/usr/share/wicd/gtk/gui.py:162: GtkWarning: IA__gtk_toolbar_set_icon_size: assertion `icon_size != GTK_ICON_SIZE_INVALID' failed
  self.wTree = gtk.glade.XML(gladefile)
refreshing...
ESSID : SFR_60E8
refreshing...
ESSID : SFR_60E8
removing profile
refreshing...
ESSID : SFR_60E8
removing profile
ERROR:dbus.connection:Unable to set arguments (None,) according to signature u'v': <type 'exceptions.TypeError'>: Don't know how which D-Bus type to use to encode type "NoneType"
Traceback (most recent call last):
  File "/usr/share/wicd/gtk/netentry.py", line 778, in toggle_default_profile
    wired.SaveWiredNetworkProfile(self.combo_profile_names.get_active_text())
  File "/usr/lib/python2.7/site-packages/dbus/proxies.py", line 140, in __call__
    **keywords)
  File "/usr/lib/python2.7/site-packages/dbus/connection.py", line 620, in call_blocking
    message.append(signature=signature, *args)
TypeError: Don't know how which D-Bus type to use to encode type "NoneType"
ERROR:dbus.connection:Unable to set arguments (None,) according to signature u'v': <type 'exceptions.TypeError'>: Don't know how which D-Bus type to use to encode type "NoneType"
Traceback (most recent call last):
  File "/usr/share/wicd/gtk/netentry.py", line 778, in toggle_default_profile
    wired.SaveWiredNetworkProfile(self.combo_profile_names.get_active_text())
  File "/usr/lib/python2.7/site-packages/dbus/proxies.py", line 140, in __call__
    **keywords)
  File "/usr/lib/python2.7/site-packages/dbus/connection.py", line 620, in call_blocking
    message.append(signature=signature, *args)
TypeError: Don't know how which D-Bus type to use to encode type "NoneType"
ERROR:dbus.connection:Unable to set arguments (None,) according to signature u'v': <type 'exceptions.TypeError'>: Don't know how which D-Bus type to use to encode type "NoneType"
Traceback (most recent call last):
  File "/usr/share/wicd/gtk/netentry.py", line 778, in toggle_default_profile
    wired.SaveWiredNetworkProfile(self.combo_profile_names.get_active_text())
  File "/usr/lib/python2.7/site-packages/dbus/proxies.py", line 140, in __call__
    **keywords)
  File "/usr/lib/python2.7/site-packages/dbus/connection.py", line 620, in call_blocking
    message.append(signature=signature, *args)
TypeError: Don't know how which D-Bus type to use to encode type "NoneType"
ERROR:dbus.connection:Unable to set arguments (None,) according to signature u'v': <type 'exceptions.TypeError'>: Don't know how which D-Bus type to use to encode type "NoneType"
Traceback (most recent call last):
  File "/usr/share/wicd/gtk/netentry.py", line 778, in toggle_default_profile
    wired.SaveWiredNetworkProfile(self.combo_profile_names.get_active_text())
  File "/usr/lib/python2.7/site-packages/dbus/proxies.py", line 140, in __call__
    **keywords)
  File "/usr/lib/python2.7/site-packages/dbus/connection.py", line 620, in call_blocking
    message.append(signature=signature, *args)
TypeError: Don't know how which D-Bus type to use to encode type "NoneType"
ERROR:dbus.connection:Unable to set arguments (None,) according to signature u'v': <type 'exceptions.TypeError'>: Don't know how which D-Bus type to use to encode type "NoneType"
Traceback (most recent call last):
  File "/usr/share/wicd/gtk/gui.py", line 658, in edit_advanced
    if self.run_settings_dialog(dialog, ttype, networkid, networkentry):
  File "/usr/share/wicd/gtk/gui.py", line 671, in run_settings_dialog
    if self.save_settings(nettype, networkid, networkentry):
  File "/usr/share/wicd/gtk/gui.py", line 640, in save_settings
    if not networkentry.save_wired_settings():
  File "/usr/share/wicd/gtk/netentry.py", line 703, in save_wired_settings
    return self.advanced_dialog.save_settings()
  File "/usr/share/wicd/gtk/netentry.py", line 340, in save_settings
    wired.SaveWiredNetworkProfile(self.prof_name)
  File "/usr/lib/python2.7/site-packages/dbus/proxies.py", line 140, in __call__
    **keywords)
  File "/usr/lib/python2.7/site-packages/dbus/connection.py", line 620, in call_blocking
    message.append(signature=signature, *args)
TypeError: Don't know how which D-Bus type to use to encode type "NoneType"
Erreur de segmentation (core dumped)

As shown by the backtrace, It is caused by a wrong None Python type returned in
this file netentry.py . The right result is the zero length string aka ''.

always present: in wicd-gtk-1.7.0-10.fc16.noarch.
the proposed patch in 740256 comment #3  would correct the "Description" bug but
not the one in comment 2 which is more severe (core dumped).
I lookd at it but not now. I am in holidays, after all and my french mountain: (Les Vosges) are calling me.

Can you please attach your proposed patches as unified diffs (diff -u)?  I want to make sure I am getting everything you are proposing and it is difficult to follow in Bugzilla comments.

Closing this out because it's been a month with no update.  Please feel free to reopen if you can provide the information requested in comment #4.

Thanks.