>>> "Tim" == Tim Cross <theophilusx@gmail.com> writes:

   > Just a shot in the dark here .....

   > You mentioned you used custom to modify the org-latex-classes
   > variable. Does the code in the custom 'block' of your init file have
   > beamer as one of the classes? 

No it does not and this turns out a problem, also I thought the
ox-beamer code contains a add-to-list which should do add beamer, but it
seems not to do it.


   > My suspicion is that when you added your exam class, for some
   > reason, beamer had not been loaded and was not yet in the variable
   > definition. When you edited it to add your exam class it has saved
   > a version without beamer as a class.

   > When you start emacs, with the new init and run order, the code

   >> (unless (assoc "beamer" org-latex-classes)
   >> (add-to-list 'org-latex-classes
   >> '("beamer"
   >> "\\documentclass[presentation]{beamer}"
   >> ("\\section{%s}" . "\\section*{%s}")
   >> ("\\subsection{%s}" . "\\subsection*{%s}")
   >> ("\\subsubsection{%s}" . "\\subsubsection*{%s}"))))

   > is executed and beamer is added, but then your custom settings are
   > evaluated and the variable is reset with the version you added the exam
   > class to, which has no beamer entry, is used to reset the variable and
   > the beamer setting is lost.


What you say makes send but this seems to defy the whole idea of custom!


   > I would start by deleting the org-latex-classes customization and try
   > adding it again to see if that fixes the problem. This is one reason I
   > rarely use customise - I prefer to have the code in my own init file so
   > that I can see exactly when everything is run.

Thanks! I will do that and you are very right about custom, it is very
convenient but buggier than I thought.

Uwe