[AUCTeX] beamer

[giacomo . boffi]

I have two files, test1.tex

\documentclass{beamer}
\begin{document}
\begin{frame}
  \[ a = \begin{bmatrix} 2 & 4 \\ 7 & 3 \end{bmatrix} \]
\end{frame}
\end{document}

and test2.tex (* note that here I load preview.sty and use one of the
commands here defined *)

\documentclass{beamer}
\usepackage{preview}
\PreviewEnvironment*{frame}
\begin{document}
\begin{frame}
  \[ a = \begin{bmatrix} 2 & 4 \\ 7 & 3 \end{bmatrix} \]
\end{frame}
\end{document}

When I hit C-c C-p C-d (preview-document) in the buffer of test1 I have
that the image representing the displayed equation is produced, but it
is not correctly placed --- it is placed instead at the end of the frame
source

When I hit C-c C-p C-d (preview-document) in the buffer of test2 I have
the following message in the minibuffer

error in process sentinel: LaTeX found no preview images

and a longish output from latex that I'm going to append at the end of
my post.

The first version (test1) is known to be buggy, the second one was
suggested by someone on the list to tell preview.sty how to fix the
problem with beamer frames and has worked for years.  I don't know
exactly when the problem started because I use beamer two months each
year...

Any help will be appreciated, thank you in advance ፨ g

Here follows the log of the preview compilation
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
Running `Preview-LaTeX' on `test' with ``pdflatex  -file-line-error  
--synctex=1 
"\nonstopmode\nofiles\PassOptionsToPackage{active,tightpage,auctex}{preview}\AtBeginDocument{\ifx\ifPreview\undefined\RequirePackage[displaymath,floats,graphics,textmath,sections,footnotes]{preview}[2004/11/05]\fi}"
 "\input" test.tex''
This is pdfTeX, Version 3.14159265-2.6-1.40.18 (TeX Live 2017/Debian) 
(preloaded format=pdflatex)
 restricted \write18 enabled.
entering extended mode
LaTeX2e <2017-04-15>
Babel <3.18> and hyphenation patterns for 56 language(s) loaded.

No auxiliary output files.

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Package hyperref Message: Stopped early.

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For additional information on amsmath, use the `?' option.
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No auxiliary output files.


(/home/boffi/.emacs.d/elpa/auctex-12.1.0/latex/prauctex.cfg))) (./test.aux)
*geometry* driver: auto-detecting
*geometry* detected driver: pdftex
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[Loading MPS to PDF converter (version 2006.09.02).]
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EveryShipout initializing macros 
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(./test.out) (./test.out) 
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Preview: Fontsize 10.95pt
Preview: PDFoutput 1
(./test.nav) (/usr/share/texlive/texmf-dist/tex/latex/amsfonts/umsa.fd) 
(/usr/share/texlive/texmf-dist/tex/latex/amsfonts/umsb.fd) 
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No pages of output.
Transcript written on test.log.

TeX Output finished with nothing to show at Wed Feb 28 23:42:34
LaTeX: LaTeX found no preview images