you could try restarting the Network-manager-gnome applet..
/etc/dbus-1/event.d/25NetworkManager restart
per the readme: /usr/share/doc/network-manager/README.Debian
also per the readme
Quote:
Only devices that are *not* listed in /etc/network/interfaces or which have
been configured "auto" and "dhcp" (with no other options) are managed by NM.
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