Posting Error in Firefox3

I keep encountering an error when posting in Firefox 3.

Essentially if I switch to the HTML editor (to embed and image, link or delete all the <blockquote> that get left behind when deleting a quote within the* quote) it doesn't switch back properly.

I have to press the design button twice. If I press the design button only once I appear to be in a stage half way between the rich text editor and the html editor.

It replaces all the HTML tags with their correct formatting - and the text appears as if in rich text but all the formatting options are greyed out - <b>like this</b>:



Any changes I make in this mode are not kept when I post the post - hence the number of posts I've made recently (and had to go back and edit) with just a quote and not comment.