Uhm..
Is it common to loose coins on Cryptsy? I placed an order about an hour ago..the order is gone and so are the Bitcoins, but I never received anything?!
When the servers get hit hard, yes. I got buy/sell orders that I cancelled and got into negative..it all worked out since I made a profit off of those negative coins, but I would make sure to not be spamming the cancel/buy/sell button when this happens.