An instance of nm-applet is already running.

if there is more then one session of the same user, NM applet wont start!

ProblemType: Bug
Architecture: amd64
CRDA: Error: [Errno 2] No such file or directory
Date: Tue Mar 23 10:16:00 2010
DistroRelease: Ubuntu 10.04
IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20091130)
IpRoute:
 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.68 metric 2
 169.254.0.0/16 dev wlan0 scope link metric 1000
 default via 192.168.1.254 dev wlan0 proto static
Keyfiles: Error: [Errno 2] No such file or directory
NonfreeKernelModules: nvidia
Package: network-manager-gnome 0.8-0ubuntu2
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-16.25-generic
SourcePackage: network-manager-applet
Uname: Linux 2.6.32-16-generic x86_64