I recently upgraded my org-mode from 8.2 to 8.3. So far all works well, but I ran into the following problem: when creating a LaTeX Beamer presentation in org-mode I used to be able to do the following to get a block without a title:
** :B_block: :PROPERTIES: :BEAMER_env: block :END: Text in block without title With Org 8.3 I get the text :B_block: as title of the block instead of not title at all.
Here is a MWE:
#+OPTIONS: toc:nil #+TITLE: A title #+DATE: 2015-09-17 #+AUTHOR: The Presenter #+LATEX_CLASS: beamer #+BEAMER_THEME: Madrid # The following line gives access to the C-c C-b key for headings #+startup: beamer * Introduction ** A block :B_block: :PROPERTIES: :BEAMER_env: block :END: Some text in the block. ** :B_block: :PROPERTIES: :BEAMER_env: block :END: Text in block without title With Org 8.2 this gives the following slide: 
I didn't find anything related in the Changelog. Did I miss something or have I found a bug? Or have I made some practical use of a bug that has now been 'fixed' ;-)?


\phantom{dummy}; but I can't manage to find how to use it exactly :-/