Was this solved? I am having the same issue with a purchased domain.
(1)
Within the domain manager of "GoDaddy" I have specified both name servers as follows:
(i) ns1.x10hosting.com
(ii) ns2.x10hosting.com
(2)
When I add a domain (i.e., "park a domain" or "addon a separate domain") within x10 I get an error message as follows:
"Unable to add the domain name - Sorry, the domain is already pointed...on that remote nameserver."
This is not a time issue as nameservers were set and updated successfully two weeks ago.