Although I cannot clarify conditions, javascript error occurs at the time of form operation, and ajax processing don't finish.
I wish improvement of qa-page.js (L39 - qa_set_inner_html()).
Before:
function qa_set_inner_html(elem, type, html) { elem.innerHTML=html; }
After:
function qa_set_inner_html(elem, type, html) { if (elem) elem.innerHTML=html; }
Related question(2012-04): http://www.question2answer.org/qa/14327/javascript-error-at-first-answer
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