1) Main menu music sometimes plays in two instances, that means two unsynchronized versions of the same track running at the same time. This happens when I try to join to the server and cancel it in the process or it fails to connect. This was present in the multiplayer demo.
2) When Crysis 2 is running, ventrillo, miranda, VPN and Crysis 2 - all loose connection to the Internet. It happens randomly, and only when Crysis 2 is running. It is not bandwidth issue, I have no problems with other games (e.g. BF:BC2) and it was not present in multiplayer demo.
I have other issues as well, but they are all listed in first post.
P.S.: Please advertise that your game does not work out of the box next time. Or better - delay it, fix all crucial bugs, and only then release it. Right now multiplayer on PC is pretty much unplayable mess. I hope you'll fix all of it soon.