Hello, just wanted to say that I too am having this problem, and it is pretty much game breaking.
When you are first able to collect nanocatalyst in the game, I was able to and purchased 1 upgrade, then I started saving. Next time I checked (beginning of the mission 'Gate Keepers') I have zero, and the total does not accumulate, despite the game telling me I just gathered some. Here is some info on my system, if it helps at all:
AMD 955 Black Edition x4 @3.4GHz
4G Ram
Sapphire Radeon HD 5870 w/1GB Ram, stock settings. Cat 11.2
Windows 7 Ultimate x64
iZ3D Monitor
I really hope Crytek is able to fix this issue soon, so I can continue playing this behemoth of a game
