Same here.. "Withdrew" 5.75 ETH this morning. 

Withdrawal history shows this transaction as complete and Tx number is provided which is non-existent on etherscan..

Submitted support ticket, but given the negative feedback on polo's support seems that this will take a while...

Damn.. I hope I'll be able to recover my ETH..

Guys, please give updates on your cases (especially if you will succeed to get your money back).