Since 6.1 named has been changed to loose root priviledges. However, not old files aren't adopted to reflect this. And also /var/run files are still owned by root. Doing a upgrade will result in errors when doing zone-transfers and such (permission denied errors).
This should be fixed in bind-8.2.2_P5-10, soon to be in Raw Hide (ftp://ftp.redhat.com/pub/rawhide/).