I put a thinrule in a table as follows: \starttext \bTABLE \bTR\bTD\thinrule\eTD\eTR \eTABLE \stoptext It worked fine under MKII. However, when I switched to MKIV (both current and beta) I got the following error message: ! Missing { inserted. <inserted text> { <to be read again> & <inserted text> ...blrow \makeTBL 1 1 \nexttblcol \endtblrow \flushtbltoks ->\begintbl \the \tbltoks \endtbl \endTBL ...x {\trialtypesettingtrue \flushtbltoks }\lettbldis \maximumcol \z... \eTABLE ...}}\eTBL }\removeunwantedspaces \endTBL \stopTBLprocessing \fi \eg... l.4 \eTABLE Is this a bug? Is there a workaround? Thanks, Bart