Comment 26 for bug 430125

NetworkManager (aka "nm-applet") is running just fine for me, but I've rebooted since my "dhclient" invocation -- if you haven't, it's possible that NetworkManager got confused because you'd already configured your network since bootup. Try rebooting?

In any case, if your NetworkManager problem persists after rebooting, I'd say it's unconnected to the original bug here. :)