More, after launching a smoke grenade, the smoke pass through the walls...

It seems to exist a way to explore an explanation at this problem, with the place where the SteamApps directory is located.

I use to play on two different computers with my Steam account, and in the second one, where is the crash in saving game, I have installed that directory in Drive "D:". Steam being installed on the "C:".
In the first one the whole Steam installation is set on the C: drive. In that case, saving and autosaving, and restoring saved files, don't cause crash.
May be that can help you in fixing the issue.

Same thing for me, uploaded my files...