On Tue, 17 Aug 2010 15:11:10 -0700, "Philip J. Hollenback" <philiph@pobox.com> wrote:
> 
> On Tue, 17 Aug 2010 21:29 +0100, "Eric S Fraga" <ucecesf@ucl.ac.uk>
> wrote:
> > What have you defined in your org setup at the start of the tile.  In
> > particular, this line in the example presentation on Worg is crucial:
> > 
> > #+OPTIONS:   H:3 num:t toc:t \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t
> > 
> > specifically the H:3 bit that tells org to use up to 3 levels of
> > headings or else level headlines get treated like lists, as far as I
> > remember.
> > 
> > In any case, can you send me an example that doesn't work that I can
> > try?
> 
> Sure, here's the presentation.org from the website, which does have that
> OPTIONS line.  It produces no blocks for me:
> 
> #+LaTeX_CLASS: beamer
> #+TITLE: Example Presentation
> #+AUTHOR: Carsten Dominik

[...]

That is the old tutorial.  Check out this one:

http://orgmode.org/worg/org-tutorials/org-beamer/tutorial.php

with associated presentation file which seems to have been munged
somehow on Worg (well, on the web site; the git repository has the
right version) so here it is attached.

I hope this helps.  I think the key is that you are missing the
startup beamer option?