NPF not loading and starting at boot

["J. Lewis Muir" <jlmuir%imca-cat.org@localhost>]

Hello.

I'm running amd64 NetBSD 6.1.4 (GENERIC) in a Red Hat KVM (RHEL 6.4.0
PC) virtual machine.  I have configured NPF to load and start at boot by
adding "npf=YES" to /etc/rc.conf.  However, after booting, NPF is not
running:

===
# npfctl show
Filtering:      inactive
Configuration:  empty
===

Starting it by hand using the rc.d system works fine:

===
# /etc/rc.d/npf start
Enabling NPF.
===

Ideas?  How should I go about debugging this?

Thanks!

Lewis