Not really an answer, but it does seem to be a bug in Questions/Confluence here. I get the same, almost always on comments.
A workaround that usually works (but needs you to have answered or commented on it already, or be a power-user who can edit other people's stuff) - once you get the spinny wheel, go back up the question to a previous entry and click "edit", let that screen render, and then cancel the edit. The answer/comment option then seems to work. Sometimes, you have to use "save" rather than cancel, but most of the time cancel fixes it.
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