Registration still closed! WTF? 
Registrations are now open and login works smoothly as well. Problem solved for now.
Great news, but take this as an opportunity to remove your funds from the site. I would recommend that people do not register at this time. The past two weeks have shown that Nova is completely incompetent at securing a cryptocurrency exchange on a basic level.
Shutting down registrations for 2 weeks and mass IP bans in response to DOS and intrusion attempts? I believe withdrawals are still being manually processed, and many people haven't been able to withdraw for days/weeks. And that note about the "beta" status of their exchange in the terms..... everything about this screams "get out while you can!"
Ahh I see yet another "hack" attempt on Nova....
DYOR and you will see they have been hacked before and lost users funds due to their incompetency with running an exchange.