Please see comment #12 on the upstream bug: http://bugzilla.gnome.org/show_bug.cgi?id=564709
The real problem was nm-system-settings returning non-null zero-length secrets over dbus (secrets that should not have been returned at all). However, the latest nm-system-settings (from svn) works correctly, fixing the original bug (without the need for my patch). So the bug was apparently fixed upstream sometime in the last few months, but I have no idea exactly when. Phillip
