Treyarch has confirmed that it's preparing a fix for reports of lost progress in Call of Duty: Black Ops 2.
"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," the developer said on Twitter (via VG247), "Currently working through server side issues re leaderboards. They'll be re-enabled as soon as we've fixed the issue. Stand by."
Players have been complaining of play time, prestige rank, KDR and other stats being reset, so news of a fix will no doubt please those who have been experiencing these issues.