centering blocks cause latex export to crash

[Robert Goldman <rpgoldman@sift.info>]

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I am using the latest org from git.

The attached org-mode file causes latex export to crash with an error of
"unbalanced begin/end center blocks with ...."

This did work, as recently as a month ago, so something relatively
recent has broken it.

best,
r

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#+TITLE:     center-export-bug.org
#+AUTHOR:    Robert P. Goldman
#+EMAIL:     rpgoldman@sift.info
#+DATE:      2011-12-14 Wed
#+DESCRIPTION:
#+KEYWORDS:
#+LANGUAGE:  en
#+OPTIONS:   H:3 num:t toc:t \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t
#+OPTIONS:   TeX:t LaTeX:t skip:nil d:nil todo:t pri:nil tags:not-in-toc
#+INFOJS_OPT: view:nil toc:nil ltoc:t mouse:underline buttons:0 path:http://orgmode.org/org-info.js
#+EXPORT_SELECT_TAGS: export
#+EXPORT_EXCLUDE_TAGS: noexport
#+LINK_UP:   
#+LINK_HOME: 
#+XSLT:
#+TAGS: noexport

#+begin_center
Not Cleared for Public Release
#+end_center

* Problem with centering block.

My document fails to export successfully to latex with the above =center= block
in it.