How is someone freezing my chat room screen?

Someone has been freezing me in a chat room.. every time I go into the chat, they whisper something and my screen freezes.. the only way to get text back on the screen is refreshing the chat room.. How is this done ?

I don't think it has anything to do with someone else. It has more to do with your computer freezing up. Do a cleanup on it, or defragment it. Or it might just be an old computer. People in a chat room do not freeze up your computer. Learn a little more about computers.