I’ve noticed that since the patch steam just recently applied, some of my text (such as the redeployment flashing red text) has become corrupted, appearing as fuzzy blocks where each character should be. In addition to this, the audio problems (where a sound would keep repeating itself even if you are out of range of the object making the sound or the event causing the sound had ended) is worse than it was previously. Lastly, I encountered one mission in particular where the entire enemy team (in campaign multiplayer co-op) were invisible and I could only see the tracers from their weapons fire.
Just wanted to point these out since the game worked almost flawlessly beforehand. It seems to have been the only thing that has changed.
Graphics: Nvidia GeForce 570 GTX (Driver version 270.61)
Sound: Creative Soundblaster X-Fi
OS: Windows 7 Home Premium (64-bit)