I beat Crysis 2 and started a new campaign but all my nanosuit upgrades are gone. I also tried to replay an old mission, but again the nanosuit upgrades were not there. When I beat the game, the suit was fully upgraded. What's the problem? Am I doing something wrong?

Did you create a new profile or did you just try to start a new campaign? It should give you a warning prompt if you just try to create a new campaign.

When you view your profile, what details does it list on the right hand column?

to keep all ur stats in sp u have to go replay mission not start a new mission

I beat it yesterday, then started a new campaign under the profile I beat it with. I got the prompt that said my saves would be lost. However, when I began the campaign I DID have all of my modules and the extra nano catalyst I finished the previous game with.

So, no problems for me. It worked great. I'm loving Stealth & Mobility Enhancement in the early levels, I can run by most of the enemies without even taking one shot or being seen. I hope you get this resolved.

I have a problem as well.
I completed the campaign, then, when I went to create a new game (overwriting the game I've beaten) I started the game with the same upgrades I had when I first finished. But now, when I collect Nano-Catalyst, the count always stays on 0.

I would like to see that fixed, and I would like as well that the upgrades did not preserve when overwriting an old game.

Good luck for the staff!

+1
got the same problem...
game is running on Vista Ultimate x64 SP2

with the nano complete the last level again and it should put u back above zero and it should stick thats what i had to do and i now am sitting on about 63000. because what has happened is the game has taken nano for all the upgrades u did and took it out off ur collection so u have a negative number of nano, so either replay last mission or play a few missions

This happened to me after the 1.2 patch. I also lost all of my unlocks including music/videos/emails/collectibles/etc.
No big deal, I'll have to play through again