The Poloniex's Clam client seems to be in some troubles. When I deposited the clams it took 4-6 hours to get credited few days ago.
The withdrawal today ended up with Complete: Error. And the coins were not credited back to the balance. Contacted support.
Anyway, the margin lending is really high there.
I got a problem while withdrawing from poloniex too. In the withdraw history there was a txid, but a invalid one that do not show up on explorers. A huge amount, scared the soul out of my body! They took a week to solve that. But for now, i will just send and receive small amounts from poloniex until the bullrun ends
UPDATE: I got the coins credited back. I did new withdrawal. Now I got "Complete" with txid... But the transaction doesn't appeared on the blockchain.