I was facing a problem with yahoo messenger, that the text I type and send is not seen in the window above, and also offline message was not displayed when I login to the messenger. Neither you can buzz. This problem was solved as I followed the steps below.

Go to Run -> HKEY-CURRENTUSER-> Software -> Microsoft -> Windows -> Current Version -> Internet Settings -> Zones -> Delete folder other than 0,1,2,3,4

Try this worked fine in my case.