one week ago I reported that export to latex/beamer refuses to export,
and the reason where it did not do it was, according to my email


(slides that contained that derailed the export terminally).

In the meantime, I found one line that, when removed, solves the
problem. In that sense, one might say, it's not BMCOL which is the
problem but the the combination. The problematic ``feature interaction''
is with the package

                   (require 'ox-extra)

which in itself does not cause the damage, but if I add

                   (ox-extras-activate '(ignore-headlines))

then that kills the export.  Note: there had been a time when that still

PS: I tested it on the very latest git-pull (org-mode-version 9.1.6) and
emacs-24.3.1 (but I had similar problems for emacs-25, only that I did
not veryfy that it's the same line with ``ox-extra'' that causes the
trouble, but it's more than plausible).

>>>>> "Martin" == Martin Steffen <mstef...@ifi.uio.no> writes:

    Martin> Thanks a lot, it may be that my emacs suffers some
    Martin> ``package-overload'', i.e., maybe it's due to an
    Martin> interference with some other lisp stuff I load.

    Martin>  I just wanted to hear if it's known to be a current glitch
    Martin> of the export-beamer thing, before I try to drill down
    Martin> (especially since the priority is to make he slides compile
    Martin> again rather than trouble-shooting..... [I just escape to
    Martin> native-latex for multi-cols for now]

    Martin> When done with the presentation, I will try to narrow it
    Martin> down, cutting down also on the amount of slides (because
    Martin> currently is a long and complex thing, which I cannot expect
    Martin> others to trawls for abnormalitiees ;-)

    Martin> Martin

>>>>> "Eric" == Eric S Fraga <esfli...@gmail.com> writes:

    Eric> On Wednesday, 14 Feb 2018 at 10:39, Martin Steffen wrote:
    >>> Hi,
    >>> since recently I have a problem with exporting org-beamer-mode,
    >>> the culprit presumably

    Eric> [...]

    >>> It seems that the BMCOL is the culprit, org-beamer still export
    >>> a complicated and long document (as it did before), but probably
    >>> a recent update made it stumble over that particular element.

    Eric> Works fine for me with org up to date from git.  Not sure what
    Eric> to suggest.  What happens with emacs -Q and loading in org
    Eric> with no customizations?

    Eric> -- Eric S Fraga via Emacs 27.0.50, Org
    Eric> release_9.1.6-118-g134243

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