Welcome to Bleeping Computer tsa730
When you send or receive an instant message and no message appears, you probably have scripting disabled in Internet Explorer.
To enable scripting, Click Tools
on your Internet Explorer toolbar and select Internet Options
Click the Security
tab, then click the Internet icon and click the Custom Level
Scroll down to Scripting
and Enable the following:
* Active scripting
* Allow paste operations via script
* Scripting of Java applets are all enabled
Click the Okay button and restart Yahoo Messenger.