Except logging in and checking my balance I don't seem to be able doing anything else like canceling orders or initiating trades.

Deposited some ETC 3 days ago nothing show under Poloniex balance. After opening a support ticket and selected ETC on one of the ticket fields that's what I got as auto-reply:

"We’re very sorry to inform you that we are currently experiencing a momentary delay on deposits of this currency.
We are actively working to identify and resolve the problem as soon as possible.
Thank you for your patience and we’re sorry for the inconvenience, don’t hesitate to reply to this message if you have any question."