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[–] 3622892? 0 points 3 points (+3|-0) ago 

I had it happen repeatedly yesterday and later found out that every one had actually posted and I had to go delete all the duplicate postings.

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[–] HorzaDeservedBetter ago 

That used to happen all the time if you were spoofing the header info (Referer), and indeed the new post would go through regardless of the warning. It has stopped, but maybe it is a combination of this with something else.

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[–] AlbinoStoic ago 

Happens repeatedly to me as well.

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[–] AlbinoStoic ago 

100% error rate when comment contains a bitly link

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[–] varialus ago 

It happened to me the other day while I had a link to a book on amazon.com that I had referred to in my comment. My attempts were not actually being posted. As soon as I removed the link, it posted fine. Also the whole comment was a link, which may be relevant.