Hi there,
Thanks for the quick response. I updated to 1.9.0 as soon as I unboxed the router, and it's been very stable.
I deleted the Ruleset in Firewall, and deleted the Destination NAT rule. I re-established the GUI port forwarding that you specified below (these are the same settings I set up initially, btw). I also tried to create a port forwarding rule where I didn't specify the "Forward-to-port" value, as I read a thread where someone said that might work. No dice. Did you want me to post the config again with the GUI-established port forward?
edit - forgot to specify that my modem is in Bridge mode (Arris TM822G)
edit 2 - here's my new config:
port-forward { auto-firewall enable hairpin-nat enable lan-interface switch0 rule 1 { description Plex forward-to { address 192.168.1.2 port 32400 } original-port 32400 protocol tcp_udp } wan-interface eth0