Multiplayer crashes.
 

I get this error 30 seconds into a coop mission online with 1 other person, can some please help?

I have this same problem. It always happens when playing multiplayer coop in the "Vietnamese connection" mission after we have defeated the first attack in the beginning.

Use the hotfix: http://forum.1cpublishing.eu/showthread.php?t=26152
It solves this issue.

I installed the hot fix, but it didn't help. The game still crashes at this one mission. Other missions we have tried have worked ok.

Thank you for reporting, we will try to fix it ASAP.

Please post the dxdiag report, your internet connection, version of the game you play (Steam, GamersGate or etc.) and do you use gamespy or any kind of emulators.

That is weird crash and definitely not related to the sync issues that were solved, this is something specific to your case.

Here is my dxdiag report: http://namelesscity.net/stuff/DxDiag.txt

I have a cable (10/1 Mbps) internet connection, Steam version of the game and we didn't use GameSpy or any kind of emulator when we played.