[NTG-context] Numbering subformulas

Hi Aditya, It seems that numbering subformulas as described in your « My Way » magazine entitled « Using \startalign » does not work with mkiv. The following minimal example taken from page 6 of the above mentioned manual, does not result in what is described there: \starttext \placesubformula \startformula \startalign \NC a_1 x + b_1 y \NC = c_1 \NR[eq:c][c] \NC a_2 x + b_2 y \NC = c_2 \NR[eq:d][d] \stopalign \stopformula (\in[eq:c]) and (\in[eq:d]) form a linear system of equations. \stoptext Is this a known bug? Thanks in advance: OK