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  1.  

    This might be a dumb question, but I've noticed on several occasions recently that while I am composing an answer, and expecting to be notified of answers which appear while I am composing, the notification system is failing for me. This is awkward if I discover my answer was already (partly) given. Any idea why it's not working for me? My browser is Mozilla Firefox 7.0, running on Windows XP version 5.1.

  2.  

    Isn't this a StackExchange 2.0 feature? I don't remember seeing this on MathOverflow. (Though I may well be wrong.)

  3.  

    I think Andrew's right; pretty sure this is an SE 2.0 feature.

  4.  

    But I don't use StackExchange. I've gotten messages here at MO which say (approximately) "a new answer has been posted" followed by a clickable option to load the answer. I am virtually 100% certain of this. Maybe I'm not making myself clear?

  5.  

    I get the new answer notifications when typing answers in MathOverflow, and I think they result from some kind of occasional hits on the server. My wild guess is that this can happen when rendering MathJax.

  6.  
    Just to confirm that Todd isn't hallucinating: I've gotten such "new answer" notifications while composing an answer in MO.
  7.  

    Thanks, Scott and Andreas. It seems that I have an indirect answer: that this notification must be some sort of irregular feature (bug?), one that isn't understood well. But maybe Anton or Scott Morrison would know better.