Hi Hans,

Thank you for having fixed the issue with numbered equations in math aligned environment, noticed and reported by Mikael Sundqvist. 
However the problem is solved only when the numbers are on the right: when the numbers are on the left, there is still a discrepancy between the location of numbers in equations numbered in an aligned environment and those which are by themselves.
Please have a look at the attached PDF which is the result of the following example (using ConTeXt  ver: 2016.09.06 19:11 MKIV beta).
Best regards: OK

%%% begin math-align.tex
\starttext
\placeformula
\startformula
\startalign
\NC \exp(t_1)\exp(t_2)\NC = x_1x_2=\exp(\log(x_1x_2))\NR
\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]
with \type{\setupformulas[location=left]}

\placeformula
\startformula
\startalign
\NC \exp(t_1)\exp(t_2)\NC = x_1x_2=\exp(\log(x_1x_2))\NR
\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
%%% end math-align.tex