Minecraft crash when i try to play multiplayer

well.. when i play MC 1.6.2 and i try to play on multiplayer (online) the game just crash! and yes, i tried whit a clean minecraft.. the only new thing when i tried was that it didnt crashed when clicked multiplayer button.. but when i add a single server it crash.. so is not the button.. it is having a server.
So it can be:
1-open minecraft 1.6.2 (launcher1.1.1)
2-click multiplayer button
3-game crashes (having servers added)

or

1-open minecraft 1.6.2 (launcher1.1.1)
2-click multiplayer button
3-add server
4-game crashes (finishing adding a server)

PD: tried all the same whit 1.6.1