Now, the exchange was suddenly closed and i have some Bitcoins and many worthless Ixcoins.
What do you think how i'm feeling now?
No rollback, no real information about what's going on? No excuse, just shutting down, telling that someone has stolen money, bla bla...
This looks like a mafia... introducing Bitcoin forks, opening exchanges, collecting trading fees, making big profit, then shutting down, and bye...
I provided information on why it's closing down. I provided information about the double spend attempts on the i0coin block chain. The ixcoin chain has the same problems - it has a low hash rate and has no one maintaining the chain software to provide fixes. The risk is to great for the exchange to operate in this environment. If you want the chain to succeed and exchanges to open then you need to do something about encouraging more people mining and more usage of the coin.
Others in the forum here have indicated that other exchanges may open to facilitate trade in these coins. You may not be holding worthless coins you may just have to wait for another exchange. You could even operate one yourself or do 'over the counter' trades in forums and IRC. If you're worried that your coins are worthless do something about it and make them worth something.