All of a sudden when I am composing a message in Hotmail and going back to add or edit something in between some text, the new text is overwriting. I tried toggling the Insert key but it's not helping.

I am not having this problem in any other programs. I checked. So what can I do to stop overwrite when writing up a message or replying to someone in Hotmail? What else can I try?

P.S. It's not overwriting in this message box either. Just checked here too. It's just when I type an email message in Hotmail only.

Thank you for any help with this.