Ubuntu

Comment 5 for bug 1006141

A restart of nm-applet solved this issue for me (as you can see bellow):

alex@alex-desktop:~$ ps -A | grep nm-applet
21903 ? 00:00:00 nm-applet
alex@alex-desktop:~$ kill 21903
alex@alex-desktop:~$ nohup nm-applet &
[1] 22476
alex@alex-desktop:~$ nohup: ignoring input and appending output to `nohup.out'
alex@alex-desktop:~$

Hope it helps you.