"The problem was that Steam would fail a signature check between the disk version of a DLL and a latent memory version. This was caused by a combination of conditions occurring while Steam was updating the disk image of a game. This wasn't a game-specific mistake. Steam allows us to manage and reverse these erroneous bans (about 12,000 erroneous bans over two weeks)."
"We have reversed the ban, restoring your access to the game. In addition, we have given you a free copy of Left 4 Dead 2 to give as a gift on Steam, plus a free copy for yourself if you didn't already own the game."
Valve apologise for wrongfully banning innocent players of Modern Warfare 2 over the last week, which has been a major uproar in the forums. This is also the first time valve have admitted a problem with the valve anti-cheat system and the first time they have reversed account flags that stop people who have been accused of cheating from playing online.
