When i first tried, it would tell me i entered wrong password, even though i was entering the correct password and that same password would work on Yahoo! Mail (letting me know it was a Yahoo! Problem, not mine). Either that or it would just go back to the main log in screen making me have to hit "sign in" again with no success.
I really do hope they are fixing the bugs. It'd be a great way of making up the hours they are making us go without it. I'm a Yahoo! Messenger lover, what can i say, i need it!
So just like everyone else, i'll go back to doing the only thing we can do... *waits*