network-manage applet stops accepting input after sleep

I put my laptop to sleep (previously connected to a WPA2 home wireless connection, and moved to a different location, intending to connect to a new (public) wireless connection. Upon waking, the applet detected the old network was gone, and the dropdown displayed a list of new APs. When I selected the new public AP, nothing happened. In fact, no items in the dropdown (edit connections, etc) had any effect. Stopping and starting network-manager made the applet disappear and reappear, but still no effect after that. Nothing appeared in syslog when selecting items from the applet dropdown. I ultimately had to reboot.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: network-manager-gnome 0.9.8.0-1ubuntu2
ProcVersionSignature: Ubuntu 3.8.0-13.22-generic 3.8.3
Uname: Linux 3.8.0-13-generic x86_64
ApportVersion: 2.9.1-0ubuntu1
Architecture: amd64
CRDA: Error: [Errno 2] No such file or directory: 'iw'
Date: Wed Mar 20 08:22:49 2013
InstallationDate: Installed on 2012-06-14 (279 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
IpRoute:
 default via 192.168.1.1 dev wlan0 proto static
 169.254.0.0/16 dev wlan0 scope link metric 1000
 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.86 metric 9
MarkForUpload: True
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: network-manager-applet
UpgradeStatus: Upgraded to raring on 2013-03-17 (3 days ago)
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH
 wlan0 802-11-wireless 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 disabled