Also affects me, recently upgraded to Ubuntu 12.04
ThinkPad Edge 0301 Ubuntu 12.04 network-manager 0.9.4.1-0ubuntu4.1 network-manager-gnome 0.9.4.0-0ubuntu1
sudo killall NetworkManager does not fix.
SystRestart fixes the problem.
Also affects me, recently upgraded to Ubuntu 12.04
ThinkPad Edge 0301 manager- gnome 0.9.4.0-0ubuntu1
Ubuntu 12.04
network-manager 0.9.4.1-0ubuntu4.1
network-
sudo killall NetworkManager does not fix.
SystRestart fixes the problem.