I can explain it as far as i know as a non-admin, that it has to do with the reply protocol not loading properly. Like if you get the rich-text reply box, but it doesn't have any of the rich text options, or if you don't get rich text at all and get a pure html version, well then the site can't process what you just submitted.
The key issue is to pay attention to the reply box. If it's off somehow, chances are your post won't appear, as i've encountered this before.

Monster Hunter: pissing me off since 2010.







