Uuups. Looks like a little bug here. I have hit the "Post Comment" Button without something loading or updating. So I've hit it again and again after going to the discussion overview. There I saw I posted 3 comments without recognising. (Windows XP, Java and Javascript on, FF 3.0.10)
We were meaning to put a spinner after you hit post. We'll be adding it shortly. We are against disabling the button altogether because we've seen this cause problems too many times in other products.
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Vanilla co-founder