I sent some ether to a myetherwallet address. When I load up the wallet info page it says 0 ETH balance, but the link to the etherscan.io address shows the correct balance.
Bitcoin transactions take about 30 minutes to receive 3 confirmations and be considered complete, while ether transactions require 50 network confirmations and about the same time. All transactions should be visible to both parties as soon as sent.
Try to wait and confirm to both parties if the trasfer succeeded.