I've not heard any other complaints about them but I do know that it's common practice for sites that deal with a lot of coins to keep two wallets, one "hot wallet" that is live on the site and holds only a small amount of coin to handle expected daily tx volume and one "cold wallet" that is held offline or on a different PC so that it cannot be compromised by hackers gaining access to the server. It sounds like they just ran out of funds in their hot wallet. I'd give them a bit to transfer from cold storage before pulling the scammer trigger.