Cheers for the help everyone, the links supplied by Tim and James will help immensly in the future! I know my config is a little nasty and I should have included a bit more of my CHANGELOG history. It was broken before changing the NS details for the domain, they originally did not mismatch. It was a case of paradise caching a bad configuration for over 12 hours which I found particulalry weird, and it probably did not help that I was fiddling every hour or so with the configuration. I left it overnight for 8+ hours (with being able to successfully query all my NS's and get full results) and it still did not refresh with the latest working records. Things seem to have sorted themselves out, now I'm going to slap myself on the wrist and tidy up my conf. - Drew