Go button don't work on the updater

Can you look in the host-file (C:\windows\system32\drivers\etc\host), and remove any reference to  api.crashtastic.com , and try logging in again?  

The same thing is happening to me right now, i've tried Mark's suggestion and it still won't boot up.

The server was down earlier, so this is probably the cause of the issue. Give it another go, and let me know if it still isn't working for you.