Usually this happens when I log on to Yahoo.
211846
Last time that happened to me, it was a computer FULL of viruses. It was a computer that belonged to someone else - they had asked me for help. We took it to the computer tech, who said he had never seen so many virus hits on one computer.
256883
This sometimes happens to me - no worries mate
304001
Yes, it happened to me also. I just logged out and logged back in. It's so weird!!
347175
It happens from time to time on Buzzen wait a little bit and try to log back in
56251
The problem is on Yahoo's end, they'll fix it soon.
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.
612021
There is a problem with Yahoo! Mesenger today. Most users can't log in. But other Yahoo! services works just fine. Maybe they're undergoing maintenance or something.
263181
I'm sorry, but are you talking about a forum on another site?  If such a thing happens on both computer it's probably the site's problem.
654053
This is generally caused by having at least 2 computers with the yahoo messenger on it that automatically signs on when the pc is turned on.
17196
Well, sometimes there is a lag in the yahoo system since there are probably thousands logged on at a time. :-)
647497
mine is doing it to.\ndoes it say like u have succesfully logged on to etc.?\ndo u have AIM?
104264
There is a glitch in the programming of the website.  If you enter it later it will usually show up.
29457
Probably its the way how mac ie handles the code on that page. send a help mail to yahoo. they should have a solution to that.
22191
there is something wrong with the computer or the site
7931
Make sure that you are logged in. Sometimes you will get logged out. Make sure you are signed in and try again.
641529
the same thing with my yahoo
182975
Does this happen in a specific computer in a specific internet service provider?Is it in your office,school or university or college? It might be coz those services are through the university server.They wont allow you to go to certain sites for either chat,nudity etc etc.Do you try to log on to yahoo through Texas A$M university computers?You cant break through those  then in that case.No, yahoo is not concerned with this.Its the server your computer is connected to responsible.