@paid.. I guess its bad news for you.. I checked it again and found out that when remember password is enabled.. and when you logout after a chat session the actual characters in the password field is infact "password" , but when you click sign in , it yahoo logs you in. I realise that yahoo developers have delebarately done this so that someone cannot use such tools to hack others password. I have been using yahoo for many years but didnt realise this till now.
Edit: I will check again with a professional testing tool tmro at my office and will let you know, if that tool shows the characters as "password" then my guess is true keep your
Update:
@Paid: I checked with the testing tool and there is some bad news for you.. the characters behind the asterix is infact "password"
Hope you will find out other alternatives to get back your password.