Looks like bleutrade froze anoncoin for some reason?

Anyone have any ideas?

Their message is below.

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This market is frozen: [ANC] We are investigating a major problem. We are suspecting that the application anoncoind is suffering loss of coins due to a possible bug. We need to wait for the blockchain work again to confirm this hypothesis. Currently the network is stopped a few hours. http://ancblockchain.com/chain/Anoncoin

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https://bleutrade.com/exchange/ANC/BTC

I thought the long block times where simply high difficulty?