Will be re-enabled once the server-side issue is resolved.
Yesterday's Black Ops 2 title update has left some players experiencing leaderboard issues, Treyarch has confirmed and hopes to fix the problem soon.
They are pretty severe issues too, with users reporting that their score and rank has been reset to zero.
"Since this morning's backend update, we've been made aware of leaderboard issues that some are having — we're looking into it, stand by," Tweeted the studio.
"Currently working through server side issues re leaderboards...they'll be re-enabled as soon as we've fixed the issue...stand by."