\nomarking no working??

Hello all,

The example in the wiki for nomarking is (when rounded out with \starttext
and \stoptext):

\starttext
\chapter{This title is long \nomarking{enough to cause problems in the headers
and footers}}

Here the whole title will be displayed as normal, but if the chapter title is 
used as a header or footer it will be displayed as:

This title is long ...
\stoptext


Disappointingly, when I run this example, I get

---------------------------------------------------------------------

tex error       > tex error on line 1 in file ./stuff_run-tex.5addq4kPxq.tex: Control sequence expected instead of undefined
<lua input> 
<macro> \currentcolorparameter 
    \dostarttaggednodetail \t!sectiontitle \ifrelax \deepstructuretitlecommand \structuretitle 
    \else \expanded {\noexpand \deepstructuretitlecommand {\structuretitle }}\fi \dostoptagged 
<macro> \currentheadlabeltag 
    ...lax \ifcsname \currentheadhash \c!deeptextcommand \endcsname \expandafter \let \expandafter \deepstructuretitlecommand \lastnamedcs \fi \ifconditional \headisdisplay \headparameter \c!textcommand {\setstrut \begstrut \getheadtitle 
    \endstrut }\g ...
<macro> \18>:152>:normal 
    ...er \plusone \noindent \box \scratchbox \kern \headnumberdistance \else \ifzeropt \headtextwidth \ifzeropt \headwidth \else \hsize \headwidth \fi \else \hsize \headtextwidth \fi \noindent \fakeheadnumbercontent \fi \headtextcontent 
    }
<macro> \somefontspec 
    \edef \p_command {\headparameter \c!command }\ifempty \p_command \directsetup \currentheadrenderingsetup 
    \else \p_command \headnumbercontent \headtextcontent \fi 
<macro> \currentstructuresynchronize 
    ...enceattributes \bgroup \strc_rendering_initialize_interaction \spac_grids_set_local_snapping {\headparameter \c!internalgrid }\useheadstyleparameter \c!style \setinlineheadreferenceattributes \strc_rendering_inject_number_and_text 
    \egroup \fi \ ...
 ...
<line 3.3> 
    and footers}}
 1 >>  \starttext
 2     \chapter{This title is long \nomarking{enough to cause problems in the headers
 3     and footers}}
 4     
 5     Here the whole title will be displayed as normal, but if the chapter title is 
 6     used as a header or footer it will be displayed as:
 7     
 8     This title is long ...
 9     \stoptext
10     
You injected something that confused the parser, maybe by using some Lua call.
mtx-context     | fatal error: return code: 1

---------------------------------------------------------------------

If I remove \nomarking, the example successfully compiles.


Is someone able to tell me if I am doing something wrong, and, if so,
exactly what I need to do in order to get on the correct path?

Thanks.

                                Jim

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