The argument inset must be in the language of the quotation. If not, you get an environment that beamer cannot parse.
LyX should probably just pass those arguments without language changes.
OTOH there are also arguments that contain text in a specific language.
Jürgen
Am Montag, den 19.09.2016, 22:49 -0400 schrieb Scott Kostyshak:
> I wonder if this is the language nesting issue?
>
> Attached is a more minimal example that gives the same error, which
> is
> the following:
>
> -----
> Runaway argument?
> \let \AtEndDocument \@firstofone \@enddocumenthook \@checkend
> {docume\ETC.
> ! File ended while scanning use of \beamer@collect@@body.
> <inserted text>
> \par
> <*> beamer.tex
>
> I suspect you have forgotten a `}', causing me
> to read past where you wanted me to stop.
> I'll try to recover; but if the error is serious,
> you'd better type `E' or `X' now and fix your file.
>
> ! Emergency stop.
> <*> beamer.tex
> -----
>
> Any ideas?
>
> Scott
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