Go the same issue with ZEC withdrawal from Poloniex... The transaction ID cannot be found on the ZEC block-chain - therefore is invalid. The funds are gone from my account. Ticket still not responded after 20 hours.
However, what's more intriguing is that a very small amount of ZEC I withdrew before went through with no problems. Hm... Not sure what's happening here.

Anybody tried recently to get ZEC out of Poloniex ?