Because of the black coin fiasco it just had. The details are sketchy but something went badly wrong. Some people are claiming they were hacked through a black coin POS bug, and others say they just had massive problems because of a DDOS attack.
Neither one of those are true. The root issue is with the software that CR uses. It was a known problem that happens with POS coins. It happened before with two coins (can't recall which ones, but read the thread that I posted the link to), then it happened with Zeitcoin, and then Blackcoin. In every instance, the CR team immediately blamed the coin devs and said they (CR) were not responsible for refunding those who lost coins. The Zeit thing basically got swept under the rug because it is a relatively new coin that is still low valued. But when it happened to Blackcoin, shit hit the fan! Read the pastebins of the chat sessions between the CR team and the Blackcoin dev. It will blow your mind!
I will say it again. DO NOT TRY TO GET US LISTED ON THIS EXCHANGE!!!