Chest does not drop

I've killed the boss just does not drop over the chest with it can not proceed with the B2F, what can this be?

already clicked on the chest that is behind where the BOSS was born, but nothing worked, the sword is useless too

be some bug of server or client?


solved, was the same customer, thank you


http://img13.imageshack.us/img13/7933/b2fa.png