Am 04.07.2013 um 00:05 schrieb Manuel González Suárez <manuelteral@gmail.com>:

> There is the example:
> […]

That’s not a *minimal* example.

> And there is the error:
>
> \dos ...de \begingroup \setbox 0\struttedbox {\ix
> \em #1}\setbox 2\struttedb...
> l.78 \dos{La cólera}{M~hnin}
> \dos{canta}{>'aeide} \dos{diosa}{je`a} \dos{del ...
> ?

Replace \ix with \switchtobodyfont[9pt] or better use a relative size like \tx or \txx.

Wolfgang

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