With version :ConTeXt ver: 2016.02.17 11:11 MKIV beta the following code
worked:
\define[2]\Illustration{%
\startplacefigure
[title=#2,reference=fig:#1]
\externalfigure[#1][height=.25\textheight]
\stopplacefigure}
\starttext
\Illustration{cow}{A Frisian cow}
\stoptext
With ConTeXt ver: 2016.03.03 23:31 MKIV beta I get a fatal error:
...test.tex: ! Extra }, or forgotten \endgroup
\strc_counters_register_component_list ...focus }}titledata{label{\detokeniz...
\strc_counters_register_component ...}{#3}{#4}{#9}\else \ifx \currentstructu...
\strc_floats_place_packaged_boxes_indeed ... ][#1]\globallet \previousfloatn...
\strc_floats_finish_placement ...e_packaged_boxes\dostoptagged \global \d_p...
l.30 \Illustration{cow}{A Frisian cow}
Kind regards
Willi
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