Cryptsy went under about 1.5 years ago. He claimed that the main wallet for the site was hacked, so he had to close down. Others say he ran with the profits. Either way, pretty sure I won't be seeing any of my missing coins again. If you joined in the class action lawsuit, you might see something yet.
I have not heard about cryptsy before. Was it a big exchange? I can not believe that an exchange can turn into a scammer after one night. Damn. If we can not trust the exchange, how can we trade our coin and make profit with it? how can we buy other cryptocurrencies without an exchange?