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It's been happening to me, sort of. I click on the 'post' button to publish the post, and some error message pops up, saying something about the server timing out (can't recall exact message). But in actuality, it is publishing, and the error message is itself in error. But if you don't know that you'll keep clicking the post button, which is what I did initially till I figured it out.

Aha just like I thought. Thanks for the reply, it may save many people flags and rep scores etc.