It was really slow for me the entire day so I thought it was server problems, and then I crashed and can't even launch the client. The website's down as well, and I never heard anything about a maintenance.
Guess the Preview Fixing and the ability to put licenses in our bags was too much for you to handle, Nexon
EDIT: Props to Osay for calling this
EDIT 2: Everything's back up. I guess it was just a hiccup