One thing that just bit me:
Right after posting a reply, the displayed page should be the one where your reply ended up.
Multi-posting increasingly panicky Versions of the same message over and over is not a good thing.
(But at least I was able to delete them and hide the evidence of my troubles
)
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We could also use a "reply to original post" button somewhere at the top and bottom of the the page, like we had before.