Not sure if this is the right place, but I just started a thread (Tour of Duty vs Origins) with quite a long post. Once my text exceeded the length of the original text box, it started jumping up and down every time I typed a character. I ended up using Outlook to type the message and then cut and paste it.
I accept it might be me.
If it helps, I didn't have any keys jammed and am using IE8 on XP SP2. (I know, Microsoft own me).
