QUOTE (tisoz @ Oct 21 2009, 11:56 PM)
I've had it happen during a poor wireless connection. It goes something like: post the message, get a blank screen, click "Refresh" and wind up at a thread with a double post.
And as above, I think I have hit the "add reply" button, the connection was slow or spotty, and re-click the button thinking it did not register the first time.
I believe that's the source of 99/100 double posts.