Call of Duty: Modern Warfare 2 multiplayer seems to have had a decent enough start this weekend, but there are still quite a number of bugs that need to be resolved.
One rather serious one is an issue with the ping feature that allows players to "wallhack" - keeping tabs on an enemy player wherever they are. This was shown in action via the Modern Warfare 2 subreddit:
As explained in the post above, you can ping an enemy when you're on the kill screen, and the ping will then stay on that particular player for the rest of the game.
Infinity Ward hasn't commented on this bug publically, but it seems the ping feature has been temporarily disabled in public multiplayer matches. It's still available in private games though.
Did you notice this bug yourself at all? Leave a comment down below.