Earlier this week, there were reports that large numbers of Modern Warfare 2 players on Steam were getting erroneously banned by Valve's Anti-Cheat software. While such claims are usually best taken with a grain of salt, the quantity and suddenness caused speculation that Valve's software wasn't operating correctly. A few days later, Valve president Gabe Newell sent out an email acknowledging that roughly 12,000 players had been inappropriately banned over the preceding two weeks. "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." Valve reversed the bans and gave free copies of Left 4 Dead 2 to everyone who was affected.