think i know how to duplicate the Double posts bug.
goto an article while not logged in, type what you want to say in the reply, click submit, then close the box asking you for login details, copy the text you just wrote, and sign in using the link at the top of the page, once signed in paste your text back into the 'reply' and press submit, this will create two identical posts.
goto an article while not logged in, type what you want to say in the reply, click submit, then close the box asking you for login details, copy the text you just wrote, and sign in using the link at the top of the page, once signed in paste your text back into the 'reply' and press submit, this will create two identical posts.