dd-wrt router as station bridge not routing traffic

I have a dd-wrt router set up as a station bridge. It was working for a while, then suddenly stopped. I've done everything (reflash, hard resets, reconfigure, etc) and can't figure out what's going on. The router connects to the gateway/AP (192.168.2.1) just fine, and the desktop (192.168.2.111) connects (via LAN) to the station bridge (192.168.2.112) just fine - a DHCP request goes out which succeeds, and the desktop pulls an IP from the gateway router/wireless AP (the MAC of the desktop has a reserved IP in the DHCP settings of the GW). I can then ping the station bridge, and any other devic

Question by Brydon Gibson on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.