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"could it be that openDNS depends on certain browsers for this url to work ?"
Certainly. This is the case with nearly all web pages in the world. It's the browser interpreting them.
Things to do:
Fill the DNS 3 field on your router with 208.67.222.220 or 208.67.220.222 Or better: if possible configure the OpenDNS resolver addresses on the WAN side of the router, not on the LAN/DHCP side.Add a network at https://dashboard.opendns...
"My concern was raised when -GRC-DNS Nameserver Spoofability Test- recently continue to return zero DNS."
And this test assumes that you're running an ad blocker or something similar. It could also be a browser security setting causing this.
"So tha...
It is probably the normal and optimal operation of OpenDNS in case this root server is the closest of the 13 from the OpenDNS data center you use. Why should OpenDNS query a more distant root server if the closest is available and responsive?