Same problem here, nothing so far. This was poloniex support awnser:

"Hello,
 
I withdrew ETH from Poloniex to myetherwallet a few hours ago but the TXid cannot be locate on etherscan.io.

Complete   ETH   0.10500000
2017-06-21 15:09:22
Address: 0xA359b58a61Ee200A7bb23B119C33DB9f799167e4
Txid: 0x924bf382fefafb16689c496e17842e934827d99c7248625401e66f0ed93333f0
I
Ian, disse 2 dias atrás
Dear valued customer

I am sorry to inform the ETH network is under heavy stress at the moment and some withdrawals are not being broadcast correctly.

Rest assured we will rebroadcast your withdrawal as soon as possible, thank you for your patience and I am sorry for the inconvenience.

Best regards,

Ian
Poloniex Support"


Nothing yet.... And i made a test transfer from bittrex and it was instant. This problem is with poloniex.