YAHOO! Chat Room Exploit Hitting all rooms August 5th 2008
There is a exploit going around that makes users leave the chat room there in, this is has simlar affects to the old exploit that was going around some time ago.
Bad thing about it you will not realise you even left the room until you post into the room.... then you will see catcha code come up (in yazak).
There is nothing you can do to stop this happening yet known, Hopefully Yahoo! will patch this exploit as soon as possible.
This Exploit has been fixed by Yahoo!