I am having a problem with the combination of nested \processcommalist and \startparagraphs columns and I do not see any obvious issues. Run the example below with "--mode=unroll" and it works fine. Run it without that mode, and it fails. Remove the lines tagged "problematic" and run it without that mode and it completes, although without the columns.     % macros=mkvi     \defineparagraphs  [Col] [n=3]     \setupparagraphs   [Col] [1] [width=.31\textwidth]     \setupparagraphs   [Col] [2] [width=.31\textwidth]     \setupparagraphs   [Col] [3] [width=.31\textwidth]     \starttexdefinition doOuter #OUTERVALUE             \define\Outer{#OUTERVALUE}             \startparagraphs[Col]      %%% problematic             \doifmodeelse{unroll}                 {\startparagraphscell                      \Outer XX                  \stopparagraphscell                  \startparagraphscell                      \Outer YY                  \stopparagraphscell                  \startparagraphscell                      \Outer ZZ                  \stopparagraphscell}                 {\processcommalist[XX,YY,ZZ]\doInner}             \stopparagraphs            %%% problematic     \stoptexdefinition     \starttexdefinition doInner #INNERVALUE              \startparagraphscell      %%% problematic                  \Outer #INNERVALUE \par              \stopparagraphscell       %%% problematic     \stoptexdefinition   \starttext       \startsubject[title={Nested processcommalist}]       \processcommalist[aa,bb,cc,dd,ee]\doOuter       \stopsubject   \stoptext Any assistance that can be provided would be much appreciated. -- Rik