On comparison, there are differences in the XML sections. The old version (8.0) has sysctl, pptpd, dnsmasq, bridge, and l7shaper that the new version (17.3) doesn't. The new version (17.3) has dhcpdv6, unbound, notifications, mailreports, and dyndnses that the old version (8.0) doesn't. I know some have to do with package differences but I wonder if some of the core changes scrambles the config on an import. I'm reinstalling and manually moving the relevant portions of the XML over. I'll see how that goes.