Bug: [Orgmode] bug in latex export [6.34b]

[iemacs]

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

I exported the following example test.org to latex, the content between
\begin{multicols}{2} and \end{multicols} hadn't been replaced with
latex code.

-------------------------------------test.org
#-*- mode: org; coding: utf-8 -*-
#+LATEX_HEADER: \usepackage{multicol}

* title

\begin{multicols}{2}

** subtitle

1. first
2. second

\end{multicols}
-------------------------------------end of test.org

I got the following result

-------------------------------------test.tex
% Created 2010-01-15 Fri 13:51
\documentclass[11pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\usepackage{longtable}
\usepackage{float}
\usepackage{wrapfig}
\usepackage{soul}
\usepackage{amssymb}
\usepackage{hyperref}
\usepackage{multicol}

\title{test}
\author{}
\date{15 January 2010}

\begin{document}

\maketitle

\setcounter{tocdepth}{3}
\tableofcontents
\vspace*{1cm}

\section{title}
\label{sec-1}


\begin{multicols}{2}

**  subtitle

1. first
2. second

\end{multicols}

\end{document}
-------------------------------------end of test.tex

Emacs  : GNU Emacs 23.1.90.1 (i386-mingw-nt5.1.2600)
 of 2009-12-16 on BREPNB
Package: Org-mode version 6.34b

current state:
==============
(setq
 org-log-done t
 org-agenda-skip-scheduled-if-deadline-is-shown t
 org-export-latex-after-initial-vars-hook '(org-beamer-after-initial-vars)
 org-special-ctrl-a/e t
 org-agenda-files '("~/org/todo.org" "~/org/refile.org")
 org-startup-truncated nil
 org-agenda-skip-timestamp-if-done t
 org-after-todo-state-change-hook '(org-clock-out-if-current)
 org-agenda-text-search-extra-files '(agenda-archives)
 org-special-ctrl-k t
 org-export-latex-format-toc-function 'org-export-latex-format-toc-default
 org-agenda-skip-scheduled-if-done t
 org-latex-to-pdf-process '("xelatex -interaction nonstopmode %s"
"xelatex -interaction nonstopmode %s")
 org-export-preprocess-hook '(org-export-blocks-preprocess
org-export-bibtex-preprocess)
 org-agenda-diary-file "~/org/todo.org"
 org-tab-first-hook '(org-hide-block-toggle-maybe)
 org-src-mode-hook '(org-src-mode-configure-edit-buffer)
 org-confirm-shell-link-function 'yes-or-no-p
 org-export-first-hook '(org-beamer-initialize-open-trackers)
 org-clock-sound "d:/sound/Ringtone.mp3"
 org-todo-keywords '((sequence "TODO(t)" "WAIT(w@/!)" "FUTURE(f)" "|"
"DONE(d!/!)" "NOTE(n@)" "CANCELED(c@/!)"))
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-default-notes-file "refile.org"
 org-directory "~/org/"
 org-cycle-hook '(org-cycle-hide-archived-subtrees
org-cycle-hide-drawers org-cycle-show-empty-lines
                  org-optimize-window-after-visibility-change)
 org-export-preprocess-before-normalizing-links-hook
'(org-remove-file-link-modifiers)
 org-use-speed-commands t
 org-mode-hook '(turn-on-org-cdlatex
                 (lambda nil (org-add-hook (quote
change-major-mode-hook) (quote org-show-block-all) (quote append)
(quote local)))
                 (lambda nil (visual-line-mode 1) (auto-complete-mode
1) (auto-complete-mode-maybe)))
 org-agenda-ndays 1
 org-refile-targets '((org-agenda-files :level . 1) (nil :level . 1))
 org-confirm-elisp-link-function 'yes-or-no-p
 org-fast-tag-selection-single-key 'expert
 org-agenda-skip-deadline-if-done t
 org-deadline-string "DUE:"
 org-occur-hook '(org-first-headline-recenter)
 org-from-is-user-regexp nil
 org-export-preprocess-before-selecting-backend-code-hook
'(org-beamer-select-beamer-code)
 org-remember-templates '(("todo" 116 "* TODO %?\n%U\n%a" nil bottom nil)
                          ("note" 110 "* NOTE %?\n%U\n%a"
"~/org/todo.archive" "Notes" nil)
                          ("diary" 100 "* %t %?" "~/org/todo.org" date-tree)
                          ("appointment" 97 "* %^T %^{Event} -
%^{Place}\n%?\n%U" nil bottom nil))
 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)
 )


-- 
Kind regards,

Tian Qiu