I am experiencing the same problem.

I have created a number of userids. They are correctly created and I log in. After 2 minutes I get the message “You have been logged out of chat” and I can never re-login again using this id. I get “Invalid Username and Password”.

I sent numerous messages to Yahoo and got a auto-generated replies. They did not even bother to read the content of the email.

Any ideas? I am using Zonelarm. Using Yahoo Messenger 5.5 and this problem starting happening after I upgraded. Any help would be GREATLY appreciated.

bob