Ok, so besides me, I saw alot of others have their "Nano Catalyst" get reset to "0". Mine had this happen, but then it started back up again. Now, I did notice that mine started working again after I downloaded new nVidia drivers and installed them (beta 270.51 x64). I am not saying installing the drivers made it come back, cause I really don't know if it did or not. All I know is, mine was working, then it quit working around Madison Square map and I tried several things to make it work again (restarting the game, loading earlier checkpoints, etc..) and nothing worked, I quit playing looking for a fix online. I saw some new beta nVidia drivers and installed them, when I launched Crysis 2, my Nano Catalyst was counting kills again.

I am fixing to play through one more time @ a higher difficulty, hopefully it will 'stay working' this time!

It happened for me too. Not gonna lie, but now I don't really care about the Nano Catalyst count, since I have every module unlocked.

ehh, the bug isn't even that big of a deal. When you get nano catalyst, once you get enough for one specific module, BUY IT IMMEDIATELY. Then repeat for the other modules, it's SIMPLE.

Yeah, the game has its bugs, but comparatively, it's better than most others out there. It's just not what it could potentially be yet. People need not have such black and white thinking. So far, the devs have been rather responsive, and I've not seen locked threads yet.