What OS? What version of emacs? Are you sure you are not
picking up the org-mode bits that are bundled with emacs?
The following file (which I posted before)
--8<---------------cut here---------------start------------->8---
#+HTML_DOCTYPE: html5
#+OPTIONS: html5-fancy:t
#+BEGIN_ASIDE
Lorem Ipsum
#+END_ASIDE
--8<---------------cut here---------------end--------------->8---
Org-mode version 8.2.4 (release_8.2.4-340-g059dc0 @
/home/nick/elisp/org-mode/lisp/)
GNU Emacs 24.3.50.2 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.10) of
2013-07-14 on pierrot
Linux pierrot 3.8.0-29-generic #42~precise1-Ubuntu SMP Wed Aug 14 16:19:23 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux