remove ntpdate_sync_once.sh, ntpd -g suffices
rc.bootup: The command '/usr/bin/nice -n20 /usr/local/bin/rrdtool update /var/db/rrd/lan-traffic.rrd N:U:U:U:U:U:U:U:U' returned exit code '1', the output was 'ERROR: /var/db/rrd/lan-traffic.rrd: illegal >attempt to update using time 1459499576 when last update time is 1459509340 (minimum one second step)
A block of 10 consecutive msgs. This block sometimes repeats again.
Clean install x64. Nothing is configured yet.