The bTABLE is still broken in latest beta. Minimal example:
\starttext
\setupTABLE[c][each][width=1cm]
\bTABLE
\bTR\bTD Test \eTD\eTR
\eTABLE
\stoptext
Error log:
! Missing number, treated as zero.
system > tex > error on line 5 in file test.tex: Missing
number, treated as zero ...
1 \starttext
2 \setupTABLE[c][each][width=1cm]
3 \bTABLE
4 \bTR\bTD Test \eTD\eTR
5 >> \eTABLE
6 \stoptext
7
<to be read again>
\275>2:1
<argument> ...n \tabl_ntb_get_aut \c_tabl_ntb_col
\relax \ifdim
\localwidth ...
\secondoftwoarguments #1#2->#2
\tabl_ntb_cell_process ...\tabl_tnb_cell_finalize
}}\scratchdimen
\tabl_ntb_...
<inserted text> ...align_start \tabl_ntb_pass 1 1
\tabl_ntb_column_next \tab...
\tabl_ntb_flush_content ...p \cr \the \t_tabl_ntb
\dostoptagged \egroup
\dos...
...
l.5 \eTABLE
?
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