I have multiple domains from dynadot and well, today I bought a new domain www.threeshadesolutions.com and it seems to be pointing to www.dynadot.com (not the parked page) when I set the nameservers. :S
When you set the name servers for your domain, we send them to the central registry immediately.
Then it takes about 10 minutes for them to publish the info to the zone file.
If you don't see what you expect, it is probably a caching issue. Sometimes restarting your computer will help. Also, check the Snapshot tool in the control panel. That shows your website without any caching.
It used to updated in less than an hour (sometimes few minutes) and it was like that since i firstly used dynadot till 4 days ago but today i changed the DNS for 2 domains but it ddn't change for around 4 hours now