did i lose my bitcoin?
The coin is in that address. Who owns the private key owns the coin. Try to import the private key of 1CSSajMNx7kR6LN4QTPFJDEUvJzpH1oUpE in Bitcoin client or send it to me so I can do it!
I was able to import it on a wallet a created on blockchain.info
It would Seem MtGox will only allow you to import a PK once.