OK - fixed this one

....
Everyone should be aware of this - potential bug that affects everybody...
It turns out that a reseller of ours had setup a new domain in whm (either that or simply added 2 extra dns zone files). This domain was in the format ns1.resellerdomain.com and ns2.resellerdomain.com
Basically - and not too sure why.... This broke ALL domains added after it. NONE would resolve (including sub domains etc)...
Strange - and I'd love to hear the proper technical reason why, but I'm amazed that they could be allowed to do this in the firstplace given the results!!!!
So - Watch out for it!!!!!
cPanel.net Support Ticket Number: