Network Manager not starting vpnc on 13.04

[km]

 I use a vpnc tunnel which worked properly through NetworkManager in 12.10 and earlier. On 13.04 NetworkManager never invokes vpnc when I tell the NetworkManager GUI to start the tunnel. The configuration hasn't changed since the upgrade.

I can run vpnc-connect manually with no issue, but NetworkManager won't. The GUI shows the check mark as if its started the tunnel but vpnc itself is never invoked.

Any ideas on how to debug this? Running NetworkManager with a DEBUG log level doesn't reveal anything. The only reference to vpnc is

<info> VPN: loaded org.freedesktop.NetworkManager.vpnc

which occurs at startup not when I invoke the tunnel from the GUI.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: network-manager-vpnc 0.9.6.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.8.0-26.38-generic 3.8.13.2
Uname: Linux 3.8.0-26-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu8.1
Architecture: amd64
Date: Sun Jun 23 13:59:00 2013
InstallationDate: Installed on 2012-12-14 (191 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: network-manager-vpnc
UpgradeStatus: Upgraded to raring on 2013-04-27 (57 days ago)