I got the new client to work after a few days it was released but just last week, I started getting the server check message even though beta was online. Since then I haven't been able to launch at all. I've flushed DNS, released and renew on CMD, reinstalled, and turned off firewall. Help?!!?!?
If you receive the server check message and you are sure that you have the latest client and that no program is blocking you, the only solutions would be to try different compatibility modes and spamming the client to start, it's weird but it has worked for many people, I have myself encountered the problem a few times.
