I changed the name server settings in my registrar about an hour ago, and the domain still is not resolving. I set the name servers to NS1.X10HOSTING.COM and NS2.X10HOSTING.COM .
Works for me (new WordPress install). That is how DNS propagation works. First time looking for your site, the system gets the most current information.
But then it stores it. If you update the nameservers, your part of the system will return the old information until it becomes "stale" and it goes back a gets "fresh" information.
Your part of the system has information from before you set the nameservers. It will remain that way for 24-48 hrs.