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

[...]

> 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.

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

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