Comment 58 for bug 284596

Here's my workaround:
Add a shortcut on all user's desktops, when clicked it will execute command:

sudo pkill nm-applet;sleep 2; nm-applet&

The drawback is that the user will need administrative privilege, and will be required to enter his password to restart nm-applet under his UID. The original user will have nm-applet "stolen" from him....