I believe registerfly is updating their site and has locked customers out of modifications, as I just bought a domain & site from someone and the site is on my server but all attempts to point domain to my server have failed, been trying for 2 days and registerfly support confirms no changes can be made and to try again soon, so I emailed them back and asked for a time frame instead of try again soon & they say within 24 hours it will accept the changes, luckily the seller of the site still has it up on their server and its low traffic so no big deal, but if it was a popular site I had bought and it was down due to not being able to update nameservers I would not be happy.