This is why I learnt a long time ago – if you have an AD problem – it’s probably DNS.
Creating an empty DNS zone with the same name as your internal zone can lead too all sorts of frustration – especially with the multiple locations in AD that it can end up in. You’ll find yourself knee-deep in ADSI Edit faster than you would ever want to be.
I love DNS, but it’s gotta be right, and it’s easy to get wrong.