I don't use Poloniex much, but I'm having a problem with a withdrawal too at the moment. I've been waiting 24 hours and it's not yet on the BitShares blockchain.
My transaction ID on Poloniex is the same sort of format as yours at the moment and the status of the withdrawal is 'COMPLETE'.
I have in the past done a couple of withdrawals from Poloniex (which were successful), and the transaction ID is a different format (x.xx.xxxxx where the x's are numeric).
I guess there are internal delays at Poloniex for some reason...