For those who had the exclamation mark error after u start a room. You have to change ur system locale to Korea, then you should be fine. If you're using vista, go to Religion and Language Option, then go to Administrative tap, then click on "change system locale" button, then set it to Korea. If you're XP, then go to religion and language option, then go to advance tab, then set it to korea.
If this is not clear for you or you still have the error because you'll need to run it with AppLocale if you hadn't yet then go to the link below
http://www.cityarel.com/forums/index.php?showtopic=1963
~credit goes to GreeNTeaPl0x from ctrl forum for writing this.