I have got this problem now. My yahoo messenger is behaving oddly. While chatting it fails to show the typed messages in the chat window both sent and received.
Virus scan did not find any virus. I uninstalled yahoo messenger , deleted all related keys from registry and reinstalled it again but the problem is persisting.
The only abnormal thing i can find in my system is, there is one temp file in the temp folder of local settings which i am not able to delete. This is this file- ~DF3AA9.tmp. While deleting it says " the file is already in use". I tried to remove with "deletedr" and "cccleaner" but unsuccesful.
Is this the cause of my yahoo messenger's misbehaviour?