Hi , It seems that they're back and working now.
Dear users,
Due to an attack on Ethereum DAO on June 17, we have temporarily disabled Ethereum contracts, payouts and withdrawals. This situation is out of HashFlare's control.
Contracts, payouts and withdrawals are now restored. We have calculated a payout for 12 hours mining for ETHASH, please keep in mind that revenue data will be 50% of the actual values for June 17.
We are monitoring the situation and will update you on any changes. Read more:
https://blog.ethereum.org/2016/06/17/critical-update-re-dao-vulnerability/Mirror link:
http://pastebin.com/xW16N7Ye)