On Monday, 12 Dec 2016 at 20:04, Nicolas Goaziou wrote:

[...]

>> I have org-latex-prefer-user-labels set to t.
>>
>> Am I doing something wrong or is this a bug in org?
>
> The latter. I fixed it on maint. Thank you.

Thank you!  This now works (using CUSTOM_ID).

Now for another related question.  Should the following work?

#+begin_src org
  ,#+TITLE: LaTeX export minimal test
  ,* <<introduction>> Intro
  This is the first slide.
  ,* Summary
  As we saw on slide [[introduction]], ...
#+end_src

I get this LaTeX code in this case, again with
org-latex-prefer-user-labels set to t.

#+begin_src latex
  \begin{frame}[label={sec:org3f12c9c}]{\label{org9590917} Intro}
  This is the first slide.
  \end{frame}
  \begin{frame}[label={sec:orgfd595e1}]{Summary}
  As we saw on slide \ref{introduction}, \ldots{}
  \end{frame}
#+end_src

Should probably have asked both questions at the same time but did not
want to confuse the issue!

Thanks again,
eric

-- 
: Eric S Fraga (0xFFFCF67D), Emacs 26.0.50.1, Org release_9.0.1-134-g727478