From few days I notice in poloniex.com, that FLDC and XCP "Deposit/Withdraw" Temporarily Disabled. Yesterday I opened a ticket.
Answer:

Hi xxxxxx,

Thank you for getting in touch.

From time-to-time a wallet may simply require routine maintenance or sometimes it can be due to an issue beyond our control, such as a network or wallet fault. Either way, know that we always do everything within our power so as to get them up and running as promptly as we can.

It is worth noting also that they're disabled for everyone and not just you alone.

I hope this offers some insight. Be sure to let me know if you need anything else.

Best regards, xxxxx