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For those who cannot log on to the game, but can log on to the website.
Nexon has this password safety campaign that asks you to change your password every three months. I didn't change my password and wasn't prevented from logging in, but I hadn't been hassled about it before the new portal went up so that is a possible trigger.
Also with the portal update came the ability to actually change your account's e-mail address; I took the opportunity to change mine to a more secure and recently-made account, and had to verify. Again, a possible trigger.
And finally, when you log in you'll be asked to set security questions. I did so when I saw the opportunity, so I'm not aware whether this could be the cause of the issue or not.
Basically I had just written a very condensed three-item checklist. :P