network manager applet crashes after connecting to the internet

Network manager applet crashes and disappears after connecting to internet. The only way I can log off is to restart computer.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: network-manager-gnome 0.9.8.0-1ubuntu2
ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Date: Sun Apr 28 21:06:30 2013
ExecutablePath: /usr/bin/nm-applet
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2013-04-28 (0 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
IpRoute:
 default via 68.28.81.69 dev ppp0 proto static
 68.28.81.69 dev ppp0 proto kernel scope link src 70.12.160.58
 169.254.0.0/16 dev ppp0 scope link metric 1000
IwConfig:
 ppp0 no wireless extensions.

 eth0 no wireless extensions.

 lo no wireless extensions.
MarkForUpload: True
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
RfKill:

SourcePackage: network-manager-applet
UpgradeStatus: No upgrade log present (probably fresh install)
XsessionErrors:
 (nautilus:2069): GLib-GObject-CRITICAL **: g_object_set: assertion `G_IS_OBJECT (object)' failed
 (nautilus:2069): GLib-GObject-CRITICAL **: g_object_set: assertion `G_IS_OBJECT (object)' failed
 (nm-applet:2071): GLib-CRITICAL **: g_variant_new_string: assertion `g_utf8_validate (string, -1, NULL)' failed
 (nm-applet:2071): GLib-CRITICAL **: g_variant_new_string: assertion `g_utf8_validate (string, -1, NULL)' failed
 (process:2747): GLib-CRITICAL **: g_slice_set_config: assertion `sys_page_size == 0' failed
nmcli-con:
 NAME UUID TYPE TIMESTAMP TIMESTAMP-REAL AUTOCONNECT READONLY DBUS-PATH
 Wired connection 1 9c6852ec-721d-477e-bf09-7a94fa4d3818 802-3-ethernet 1367200934 Sun 28 Apr 2013 09:02:14 PM CDT yes no /org/freedesktop/NetworkManager/Settings/1
 Virgin Mobile / Helio connection c4141ad3-a5bd-43d8-afcb-a492ad187f22 cdma 1367201234 Sun 28 Apr 2013 09:07:14 PM CDT no no /org/freedesktop/NetworkManager/Settings/0
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH
 ttyUSB0 cdma connected /org/freedesktop/NetworkManager/Devices/1
 eth0 802-3-ethernet unavailable /org/freedesktop/NetworkManager/Devices/0
nmcli-nm:
 RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE WIFI WWAN-HARDWARE WWAN
 running 0.9.8.0 connected enabled enabled enabled enabled enabled