What operating system and/or browser are you using?
Operating System: Windows 7
Browser: Firefox

What were you trying to do when the problem occurred?
Reinstall BYOND
Close Firewall
Restart PC

I get the error:
Failed to get a security certificate from byond central. Your account password may have changed; Change your password (..)

It says something more but I can't see that.

I only get this error with the game: Naruto Way of the Shinobi from Axerob.

I get this problem on my Windows NT 5 ( Computer ) and on my Windows 7 ( Laptop )

Anyone know what's wrong?
Sign out from your pager and sign back in with the proper password. Be mindful that your password may have indeed changed so make sure you have the proper recovery email so you can reset your password in the event that you cannot access your account.