Player rank dropping back down to 1.
by Jim Reilly 
January 19, 2010 - Infinity Ward still has work to do with Modern Warfare 2.
According to several posters on the developer's official forums, a new hack for the game is going around on certain Xbox LIVE servers that gives players negative experience points for kills, which results in a drop in your rank.
A youtube clip has surfaced (spotted by Joystiq) showing the hack in action, which gives unsuspecting players -5,000,000 XP per kill.
"Me and my clan (SC) went into a game of HxC SnD, we found a group of tenth prestiges, we thought they were merely boosters, we were very wrong," one poster wrote.
"We knew something was wrong when they just waltzed out of their spawn in Highrise and let us kill them. After we won that round, they said 'AWW look at the level 1s' and we noticed..."
"Killing them made us LOSE xp.... we won the match because they ended it. Match Results: -899999453xp," the poster added.
It appears for now this hack is only widespread on Xbox 360 versions. We contacted Infinity Ward - have yet to hear back.
MovieMiguel.com
