I tried to paste some text with HTML markup into the "Reply" Box, using the (new) HTML button, but the Reply Box editor opened up full screen, and there was no button to post the text. This was under FireFox v3.6.10.

I also notice that the buttons to embed links and images have been removed from the editor. I found those buttons very usefull, and would very much like to see them reinstated. Also the FireFox spel check is no longer working in the editor.