After the first reboot in KDE 4.5.1 the network manager plasmoid stopped to work well by showing a red icon (typical error icon) with a message that says that there aren't network interfaces. The issue is that my network is working just fine. All net interfaces are up and running well. In fact nm connected to my favorite set connection but the plasmoid doesn't work well.

Is this a client app issue? Clearly it is not my system.

Thanks in advance.