When i still holding down sprint (shift) and enter a Vehicle the game crashes. now i want to know if this is just client side. :confused:
If your game crashes then it's most likely client side. If you do it and get disconnected or a "connection problem" warning it possibly crashes the server.
Just a point related to sprinting - The sound effect for it is pretty weird - it sounds as if the player has 4 feet.
Yeah, the sounds are really messed up. When you use melee you hear 2 sounds for some reason, and sometimes nearby walls are hit by it as well.