Yeah, I just noticed that. I was about to play some more Spec Ops, and then right as I go to run it, it starts downloading something VERY small for MW2. Same with the multiplayer.
This must have been a stealth patch to prevent trainers, because I have not seen any update notes on this matter.
check the latest steam update
So, you mean that the new update to the Steam client fixed this?
well have a look at it it said it fixed a steam api crash so it updated MW2 naturally