Crossfire Errormessage

Hey,

after the update I always get errors.
Its always the same, the round starts and if I shot the first bullet on the enemy the game freezes with the message "Send Errormessage" or something like this.
But if I join an already started game, I got no problems...but it still sucks.

Please help me!
And no, I never used hacks, glitches or something like this...