[BUG] LaTeX subtree export gives spurious "unbalanced begin/end_%s blocks" error

[Christian Moe <mail@christianmoe.com>]

Hi,

Here's a minimal document:

----BEGIN EXAMPLE----

#+title: Testing

* Src blocks

Here's some Lisp:

#+begin_src emacs-lisp
   (message "Hello world!")
#+end_src

----END EXAMPLE----

When I try to export the "Src blocks" subtree to PDF via LaTeX, I get 
the error:

"unbalanced begin/end_src blocks"

Export of the whole document to PDF via LaTeX is not affected.

Neither, initially, is HTML export, including subtree export to HTML. 
However, after getting an error by trying to export the subtree to 
LaTeX, I get the same error when trying to export to HTML (whether 
subtree or the whole document). I can "clear" the HTML export error by 
exporting the whole document via LaTeX again.

I'm using Org 7.7 (pulled this morning) on GNU Emacs 23.3.1 on a Mac.

Yours,
Christian