Originally Posted by r.rebergen
I assume your setup is incorrect. You need to configure the OpenDNS DNS servers on the WAN page. Every client within the network then needs to connect to your router's IP for DNS requests. I think the mixup is caused by your ISP's DNS adresses.
In my case this is set up as described and works flawless!
D'oh! Ok, this was caused by me not understanding the meaning of the "Connect to DNS server automatically" option on the WAN page. I had noticed there was no place to manually specify DNS servers on that page. It just never dawned on me that I had to uncheck that option to get the server fields to appear. Thanks for the nudge ...