Hi,
There is an extra vertical space after displayed formulas with align if pdftagging is enabled. If I remove the last \NR it goes away (but I have got the idea that one should have that final \NR there?)
/Mikael
\setuptagging[state=start]
\starttext
\samplefile{knuth}
\startformula
\startalign
\NC A \NC = B\NR
\stopalign
\stopformula
\samplefile{knuth}
\startformula
\startalign
\NC A \NC = B
\stopalign
\stopformula
\samplefile{knuth}
\stoptext