I'd say just the two IP addresses that are listed on the OpenDNS home page (just look on the bottom of their site).
If you add them to the "trusted" networks, it shouldn't block any communications from them.
Again, I don't have the AIS product, so I might be wrong, but if I was in your situation I would do just that to see what happens.
Good luck, and I hope that works for you. I can't believe that more people aren't having the problem though, a lot of avast users on the forum use OpenDNS for their DNS queries, so I'd assume there would be more discussions about this.