Kagebunshin?

I'm having a problem logging in my Yahoo! Messenger. A moment ago, I was logged in but suddenly I was logged out. I tried logging in again but I can't get through and the message I get is "you have been logged out because you have signed in another computer or device".

I already changed my password to kick the intruder if it was the case but still the same thing happened. Now I'm pretty sure that this is a server-side problem. I'm probably still logged on the server.

I just hope they do something about this SOON.