Aha. I started to debug it but you were faster.

@eric can you confirm this?

Sent from my iPhone

> On 1 Nov 2019, at 16:12, John Kitchin <jkitchin@andrew.cmu.edu> wrote:
> 
> 
> I think this is happening here:
> 
> #+BEGIN_SRC emacs-lisp
> (org-export-string-as "\\begin{displaymath}
>   \\int   f dx =0
> \\end{displaymath}"
>      'html t )
> #+END_SRC
> 
> #+RESULTS:
> : 
> : <div class="equation-container">
> : <span class="equation">
> : <img src="ltximg/latex1pIlij_8e5abfd22f18b9fd072a0f1273f49cd3a35040d3.png" alt="latex1pIlij_8e5abfd22f18b9fd072a0f1273f49cd3a35040d3.png" />
> : </span>
> : <span class="equation-label">
> : 1
> : </span>
> : </div>
> 
> 
> #+BEGIN_SRC emacs-lisp
> (org-export-string-as "$e^x$"
>      'html t )
> #+END_SRC
> 
> #+RESULTS:
> : <p>
> : <img src="ltximg/latex4ckMGO_c7e2801d6583d97def1ae1189f6c1ecf1db0d41b.png" alt="latex4ckMGO_c7e2801d6583d97def1ae1189f6c1ecf1db0d41b.png" /></p>
> 
> John
> 
> -----------------------------------
> Professor John Kitchin 
> Doherty Hall A207F
> Department of Chemical Engineering
> Carnegie Mellon University
> Pittsburgh, PA 15213
> 412-268-7803
> @johnkitchin
> http://kitchingroup.cheme.cmu.edu
> 
> 
> 
>> On Fri, Nov 1, 2019 at 9:59 AM Uwe Brauer <oub@mat.ucm.es> wrote:
>> >>> "JK" == John Kitchin <jkitchin@andrew.cmu.edu> writes:
>> 
>>    > I also see this. I wonder if you use any scimax functions?
>> 
>> Good I am relived, I thought it was just me
>> 
>>    > Do you see any advice on org-create-formula-image:
>> 
>>    > C-h f org-create-formula-image
>> no 
>> 
>> ,----
>> | org-create-formula-image is a compiled Lisp function in
>> | ‘~/ALLES/emacs/site-lisp/packages/org/org.el’.
>> | 
>> | (org-create-formula-image STRING TOFILE OPTIONS BUFFER &optional
>> | PROCESSING-TYPE)
>> | 
>> | Create an image from LaTeX source using external processes.
>> | 
>> | The LaTeX STRING is saved to a temporary LaTeX file, then
>> | converted to an image file by process PROCESSING-TYPE defined in
>> | ‘org-preview-latex-process-alist’.  A nil value defaults to
>> | ‘org-preview-latex-default-process’.
>> | 
>> | The generated image file is eventually moved to TOFILE.
>> | 
>> | The OPTIONS argument controls the size, foreground color and
>> | background color of the generated image.
>> | 
>> | When BUFFER non-nil, this function is used for LaTeX previewing.
>> | Otherwise, it is used to deal with LaTeX snippets showed in
>> | a HTML file.
>> `----
>> 
>> But I have this 
>> ,----
>> | 
>> | org-mime-htmlize is an autoloaded interactive compiled Lisp function
>> | in ‘~/ALLES/.emacs.d/elpa/org-mime-20190805.57/org-mime.el’.
>> | 
>> | It is bound to <C-f31>, <C-next>.
>> | 
>> | (org-mime-htmlize)
>> | 
>> | This function has :around advice: ‘ad-Advice-org-mime-htmlize’.
>> | 
>> | Export a portion of an email to html using ‘org-mode’.
>> | If called with an active region only export that region, otherwise entire body.
>> | 
>> | 
>> `----
>> 
>> 
>> I wounder what that is about, @Eric, do have also this setting? John?