On Nov 11, 2013 4:11 PM, "Nicolas Goaziou" <n.goaziou@gmail.com> wrote:
> According to Beamer's user guide, "columns" environment follows the
> template:
>
>   \begin{columns}[<options>]
>     ...
>   \end{columns}
>
> IOW, it is not possible to define an action specification on it.

Well, that would explain it.

What I should have done was put the BMCOL nodes directly into the onlyenv,
and allowed the exporter to create the implicit columns environment. But I
had to try to be clever first (oops).

Thanks for the clarification.

hjh