Sorry for late reply.
Here is my test again:
firmware 1.5:
Mac filtering: set ON and ALLOW list: it it still NOT working.
wireless security mode: none.
wps: disabled.
Config settings saved. Router rebooted.
Results: any computer can access the network.
Do you mind explain the relationship among MAC filtering, WPS (Wifi Protected Setup), and wireless security mode: personal, and DHCP IP Reservation list?