this happens every time i sign out,i leave and come back to my pc and sign in,it says i"m already signed in again.
126250
did u give out ur password maby someone elase has ur password and there signing under ur name
128658
change your password, someone else might be using your account... Or you left a  different computer / cell phone logged in as you and forgot.
347175
It happens from time to time on Buzzen wait a little bit and try to log back in
312748
I have mine set to sign in once daily.  I have no problems.  I save my settings.
3509
I don't know what causes it, but it has happened to me.  I just reboot my computer and it fixes itself.
618615
It sometimes does that. My girlfriend has had problems with it for a long time now. It will just sign you out automatically when you didnt do anything and sometimes you cant even log back in.\n\nYou can always download and install the older versions, dont fret =)\n\nJust go to http://www.oldversion.com/program.php?n=yahoo and you can just uninstall the new one if it continues to give you problems and get back the older ones.
581870
Try going to control panel and see if it was some kind of desktop bug that can be uninstalled.
518460
You don't say if this is during logon to window or on a website.\nIt may be you have autofill enabled in one of your browser settings, IE can be set to remember passwords. Or you have a toolbar such as Google which has remembered it.\n\nNeed more info!
547664
The only other way would be to reboot the computer.  This is setup this way as there are services that run under the userid signed on.
253471
go to "preferences" in yahoo messenger\n\ngo to "general"\n\n"check box" that says "sign out of messenger when i close main window"\n\nif checked.."uncheck" box that says "automatically sign me in...etc....\n\nall other bxs should be "unchecked"\n\nclick on "apply"\n\nrestart computer.......\n\nthis should fix problem.
78448
It may be that you are signed on on a mobile device such as a cell phone, PDA, or even another PC.
263331
My first guess would be someone else knows your account name and password. Whenever they log on it will bump you off. Create a new account and see if the problem goes away. If it does then my answer is correct. Yahoogirl u full o crap! It happens all the time! I have done it myself!
52229
As soon as you sign into your mail it changes
334230
u mean u  have 2 profiles in 1 ID?\nu make sign out for "W" & sign-in on "L" then u heard a noise?  or it says u "log off in different computer"??\n\ndisabled the JAVA! ^_^
96340
i think i understand what the problem is. it might be the "AIM today" that pops up whenever you log in. to get rid of it you must go to your preferences. after that, click on the category: sign on/off. then make sure you uncheck the box next to "Show AIM Today window at sign on". hope this helps!
123364
Usually if it tells you that you are signed in in two places you can reply to that message with the number '1'. It will then sign you off at the other location.
453343
Yeah, that's happened to me a few times before... just uninstall then reinstall.. it should work.