When posting the message body becomes jumpy.

When I post to the point where I have to scroll down it then becomes jumpy any time I type another letter and I can't edit or do nothing.

I wanted to edit my question on the audio policy but I cannot since as soon as I type it jumps and nothing happens.

be sure to have the extfield active when you type (click in it) otherwise it just jumps to a word with the letter you typed