I just tried to crash my computer by useing multiple instances of Yahoo Messenger 8.0 with your AD remover.

Remember to use caution when opening many instances of Yahoo Messenger 8.0
Chris. Each new messenger window you open will use resources and have the
chance of running out of Free Memory.

Also remember just as you are able to enable multiple instances, you are also
able to disable them as well.

If you can use other usernames that work properly and its just the one username that is not working like it should then its more likely to be a problem on Yahoo side. Meaning the data is being sent to the server but for some reason the server is ignoring it. Back when I was still using YIM 7.0 from time to time it wouldn’t change my stealth settings. I would have to exit YIM, restart it, and then in would change my stealth setting properly. It could also be a problem on your end. Meaning your internet connection. Also check your YIM connection settings. Usually you would want it set to No Proxies, however if you have it set to Firewall with no proxies, or Use Proxies, then that could also might be whats causing the problem.

You have to sign up for the beta program at

http://messenger.yahoo.com/partners_msn.php

However when you try to go to this link you get redirected to

IM with Windows Live ™ Messenger Friends – Yahoo! Messenger with Voice

If you try to contact Yahoo about this they will end up telling you
this is still in beta and no support will be given for it yet. More then
likely Yahoo was allowing a certain amount of people the sign up
and now they are not letting anymore people sign up for the time
being. I would keep checking the link below from time to time to
see if it brings up the sign up page. If you get redirected it probably
means they still aren’t ready to let more people join yet.

http://messenger.yahoo.com/partners_msn.php

The only way someone can get your IP using Yahoo Messenger is by using
P2P features. Call Feature, File Transfer, Photo Share, ect. You can’t get
someones IP in chat. As for someone knowing what chat room you are in
yahoo has removed the Go To User function. So unless you tell them or
unless someone that is in the room you are in tells someone else, the
answer is no. ( That as of right now, this could change later down the road )

You can do this without waiting for Yahoo to do it. Yes I know Chris
you would rather have Yahoo add it back. But why complain about
something that you can add back yourself ?

Here is a res_msgr.dll with the only thing that has been changed ( actually added ) is the toggle to show or hide nicknames.

Or if you want to keep waiting for Yahoo to add it back then more power to you.
Keep in mind that Yahoo knows that people can add it back and is probably
the very reason the don’t add it back.

No the chat transition one don’t work tim.

Yes I was not sure if it was removing the Chat Transistion Ad for other
users as it was not removing it for me. Thats is also why in the About.html
it states that it may or may not remove the Chat Transistion Ad.

I don’t believe it would make them loose all of their money. However I do believe it would put a nice dent in their pocket. Not includeing all of the people that might not use the messenger anymore because they got rid of the chat rooms. ( if they did ) As Dermot said, they do make money on the ads displayed within the messenger.

Edit: Yes I agree on the part that Yahoo may loose a fair deal of money if they did get rid of the chat rooms.
However, I don’t believe bugging the hell out of the Yahoo Staff is going to solve the bot and other problems in chat.
I have been using Yahoo Messenger for about 9 years now and the bots in chat have always been a problem.
You may be thinking about it in the wrong way, why not suggest to Yahoo that they add a feature like YTunnel,
to add a block feature, so when you block a name it is removed from the chat room instead of being just ignored.

There might be, but you also have to keep in mind even if it does not give them
a popup box saying such and such has denied you to add them, they would still
see that your name was removed from their buddy list. Which also happens
when you deny someone. So they might not find out right then and there when
you first choose to deny them but like I said at some point they will see your
name is gone from their list. They could either give up, or they could just
keep trying to add you again.

If it is someone that you do not want to talk to simply put them on ignore.
You will no longer get any add requests from that person anymore.