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I've figured out what is causing this problem, at least from the user's perspective. The problem seems to be triggered by modifying the "Enable email alerts" option, which is available under

Settings -> Login, Users & Communication -> Email and email alert settings

The default is True - just turn it off and see what happens. In fact, I just created a site specifically to test this out, namely, http://commentbugtest.askbot.com. I started it, asked one question, left one comment, then turned off "Enable email alerts". After that, I was no longer able to leave comments.