------------------------------------------------------------------------

Please see the attached test file ("a.org"), which I have tested with "emacs 
-Q".  


In test 1, the html export (C-c C-e H) translates the line " <!--
comment -->" to  "&lt;!-- comment --&gt;". 

In test 2, the translation is OK.

I am working on a .org file where I am using R code to generate the html
code, thus the "#+RESULTS" tag is generated by executing the R code
block.  I believe I don't have this problem with previous versions of
"org" (maybe before 7.8?).

Thanks a lot for your help! 

-- Feiming Chen

------------------------------------------------------------------

Emacs  : GNU Emacs 24.1.1 (i686-pc-linux-gnu, GTK+ Version 2.22.0)
 of 2012-08-13 on fmc.work
Package: Org-mode version 7.8.11

current state:
==============
(setq
 org-export-blocks '((src org-babel-exp-src-block nil)
             (export-comment org-export-blocks-format-comment t)
             (ditaa org-export-blocks-format-ditaa nil)
             (dot org-export-blocks-format-dot nil))
 org-ctrl-c-ctrl-c-hook '(org-babel-hash-at-point
              org-babel-execute-safely-maybe)
 org-export-preprocess-before-selecting-backend-code-hook 
'(org-beamer-select-beamer-code)
 org-tab-first-hook '(org-hide-block-toggle-maybe
              org-src-native-tab-command-maybe
              org-babel-hide-result-toggle-maybe)
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-hide-drawers
          org-cycle-show-empty-lines
          org-optimize-window-after-visibility-change)
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-speed-command-hook '(org-speed-command-default-hook
              org-babel-speed-command-hook)
 org-babel-pre-tangle-hook '(save-buffer)
 org-occur-hook '(org-first-headline-recenter)
 org-export-interblocks '((src org-babel-exp-non-block-elements))
 org-metaup-hook '(org-babel-load-in-session-maybe)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-export-latex-format-toc-function 'org-export-latex-format-toc-default
 org-export-preprocess-before-normalizing-links-hook 
'(org-remove-file-link-modifiers)
 org-clock-out-hook '(org-clock-remove-empty-clock-drawer)
 org-export-first-hook '(org-beamer-initialize-open-trackers)
 org-mode-hook '(#[nil "\300\301\302\303\304$\207"
           [org-add-hook change-major-mode-hook org-show-block-all
            append local]
           5]
         #[nil "\300\301\302\303\304$\207"
           [org-add-hook change-major-mode-hook
            org-babel-show-result-all append local]
           5]
         org-babel-result-hide-spec org-babel-hide-all-hashes)
 org-export-latex-final-hook '(org-beamer-amend-header org-beamer-fix-toc
                   org-beamer-auto-fragile-frames
                   org-beamer-place-default-actions-for-lists)
 org-export-latex-after-initial-vars-hook '(org-beamer-after-initial-vars)
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-src-mode-hook '(org-src-babel-configure-edit-buffer
             org-src-mode-configure-edit-buffer)
 org-after-todo-state-change-hook '(org-clock-out-if-current)
 org-confirm-shell-link-function 'yes-or-no-p
 )