I,ve seeing that too, but for my first time, today.
I was just playing CoD: Black Ops normally and then there just run invisible players killing people.
There is only their gamertags when pointing on them, but they are not there. Just there, killing people.
I know one guy, on Xbox 360, named MR NARCOTICS 74.
And then there's also that unlimited Mortar bomb hack.
I usually see it Cracked but now it's going on everywhere.
I just hate these guys.
I experienced 5 hackers in the last 7 days. The latest hacker used an invisibility hack and when I reported him and messaged him, he just mocked me. Infinity Ward needs to start taking action against people like this! It is very frustrating and the fact he was able to play game after game while hacking was terrible! Me and about 3/4 others reported this person and nothing was done! The persons gamer tag was: VM x Madness v2 . If you see this guy in a game, whether he hacks the game you are playing or not, report him. I will post any other names of hackers I find. Let's get all hackers kicked from all Call of Duty games!