I'm having the same problem. I was adding questions and editing their answers by clicking on the little pencil icon next to each of the answers. It was working fine. Then, after adding another question to the quiz, clicking on any pencil icon next to an answer (even ones that I previously edited as HTML) causes the screen to jump to the top, without the answer's text box expanding into the HTML editor version.
This is really a problem because I can't do things like use superscript or subscript without the HTML editing function, so chemical formulas are messed up.
Even worse, any question's answer that I edited using the HTML function is unchangeable. I can't edit its text using the normal way OR via the HTML pencil icon.
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