Description of problem:
Since yesterday's updates (20100818) nm-applet doesn't show up, and the network doesn't work. Neither WiFi (set up to connect automatically) nor eth0 (static configuration for my account). Luckily I still remember how to configure eth0 by hand :-/

Running the following ($ ~~-> me, # ~~-> root):

$nm-applet
An instance of nm-applet is already running.

** (nm-applet:3606): WARNING **: <WARN>  constructor(): Couldn't initialize the D-Bus manager.

# nmcli dev status

** (process:4050): WARNING **: nm_client_get_devices: error getting devices: Unit NetworkManager-by-dbus.service failed to load. See logs for details.

DEVICE     TYPE              STATE       

Last line of /var/log/messages is:

Aug 19 10:04:27 laptop14 kernel: init[1]: D-Bus activation failed for NetworkManager-by-dbus.service: Invalid argument

Version-Release number of selected component (if applicable):
dbus-1.3.2-0.1.885483.fc15.x86_64
kernel-2.6.36-0.0.rc0.git1.fc15.x86_64
NetworkManager-0.8.1-4.git20100817.fc15.x86_64

How reproducible:
Happened yesterday at home (WiFi) now here at work (eth0)

Steps to Reproduce:
1. Boot...
2.
3.
  
Actual results:
No network, no nm-applet icon

Expected results:
Network working normally

Additional info: