Hi Hans,

Following up the previous bug report, I tried the latest version, ConTeXt  ver: 2016.09.09 08:21 MKIV beta, and noticed that you have solved one part of the problem with the placement of equation numbers on the left, when using \startalign.
Actually the location of those equation numbers is correct as far as the horizontal distance is concerned, but it is not vertically.
In the attached PDF (which is the result of the following example) one can see that equation number (5) is placed on the grid line 10, while it shoul dbe placed on line 11 in alignment with the corresponding formula. Moreover equation number (4) does not show up at all (that number should be placed a little bit below line 9 of the grid).

Thanks in advance for your time.
Best regards: OK

%%% begin example bug-mathalign.tex
\showgrid

\starttext
With the default setting, that is \type{\setupformulas[location=right]} one gets:
\placeformula
\startformula
\startalign
\NC \exp(t_1)\exp(t_2)\NC = x_1x_2=\exp(\log(x_1x_2))\NR[eq:explag0]
\NC \NC =\exp(\log x_1+\log x_2) = \exp(t_1+t_2).\NR[eq:explag1]
\stopalign
\stopformula

\placeformula
\startformula
1+1=2
\stopformula

\setupformulas[location=left]
While with \type{\setupformulas[location=left]} one gets:

\placeformula
\startformula
\startalign
\NC \exp(t_1)\exp(t_2)\NC = x_1x_2=\exp(\log(x_1x_2))\NR[eq:explag0]
\NC \NC =\exp(\log x_1+\log x_2) = \exp(t_1+t_2).\NR[eq:explag1]
\stopalign
\stopformula

\placeformula
\startformula
2+3=5
\stopformula
\stoptext
%%% begin example bug-mathalign.tex