I have 2 computer run bitshares_client with the same wallet.(copy one from another)
but blockchain_head_block_num is much different
one is
"blockchain_head_block_num": 728,
"blockchain_head_block_time": "20140609T140400",
the other is
"blockchain_head_block_num": 449,
"blockchain_head_block_time": "20140609T140200",