I just realized that with the newer versions of q2a (guess from 1.7+) the questions cannot be edited when they are closed.
I think the edit should be available for admin always.
Can we change this back in core?
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By the way, just discovered that the q2apro userrules plugin actually solves this:
http://www.question2answer.org/qa/46554/new-free-plugin-q2apro-user-rules
