If you do not mind posting your named.conf file, I will take a look for any potential issues. Did you make any changes to the named.conf and related files (reverse DNS, etc) when upgrading? Say, if you did not put your own DNS entries but still run a caching DNS server, do you still see these errors? (I am eluding ot the fact that there is some internal confusion of anmed due to some, possibly ambiguous or bad, configuration.)