Having nothing in the DHCP log suggests nothing is making it to the DHCP server. The packet capture shows it's making it to that box at least. Check Diag>States, filter for 255.255.255.255, and make sure you're seeing that UDP port 67 traffic there when there is a device making a DHCP request on OPT1. If it is, try restarting the DHCP Server service under Status>Services (though I can't think of any reason that'd be necessary), or reboot.