"ddns-update-style ad-hoc;" - or some variant on that - is required for recent versions of dhcpd to start. As of dhcp-3.0.3-r9 there's no such line in dhcpd.conf.example, which causes dhcpd to fail to start. Reproducible: Always
I'd vote for "or some variant of that", considering that ad-hoc is deprecated and does not work. "none" might be a good choice.
Fixed, thanks. I used an update style of "none" which is in the example configs for 3.1