I tough u had fixed the serial key issues, not that i ever had any....before now .
very weird how u can say it's fixed, and 4 me who never had any trouble 2 it, now has....
My account info the same as it has bin the latest 22 lvl in MP, and patch 1.2 is downloaded and installed .
But now it says during Log in : Your serial key is incorrect. a valid serial key is required to play in multiplayer.

try to use your key with "verify" when you put your password if you look little down you see it. try this way. save it. go back to single player and try again one more time. maybe it fix it.

If u mean ''modify'', ive done it couple of times now...
same answer 2 it .

Got the same problem, as you can see here:

http://www.gamesas.com/forums/viewtopic.php?f=40&t=21879

Love it. This is probably their attempt to prevent people from using random keys to join MP. Worked well enough.

Crytek prevented pirated version from the 6th of april.

well, my version is not pirated. I still have the receipt 4 it .

Crytek prevented pirated version from the 6th of april.
And what you wanna tell us with this argument? That we have a pirated version? As you can read in my post I linked here, I need to reenter my Original Key and then it works. But as soon as I restart the game, I again receive the Invalid Key Error Message and have to enter the key again in order to join the Multiplayer.

Got the same problem, as you can see here:

http://www.gamesas.com/forums/viewtopic.php?f=40&t=21879
Please use the existing thread. Thanks