Dear List, I think I've just encountered a fragile bug. It is only reproducible with exactly the same layout as the doc below. Any insertion or removal of an item that changes the pagination would let the document compile. \defineitemgroup[choice][itemize] \setupchoice[packed,columns,one] \setupchoice[before={\blank[medium]}] \starttext .\blank[32*big] \startitemize \item 0 \startchoice[text] \item 0 \item 0 \item 0 \item 0 \stopchoice \item 0 \startchoice \item 0 \item 0 \item 0 \item 0 \stopchoice \item 0 \startchoice \item 0 \item 0 \item 0 \item 0 \stopchoice \item 0 \startchoice \item 0 \item 0 \item 0 \item 0 \stopchoice \item 0 \startchoice \item 0 \item 0 \item 0 \item 0 \stopchoice \item 0 \startchoice \item 0 \item 0 \item 0 \item 0 \stopchoice \item 0 \startchoice \item 0 \item 0 \item 0 \item 0 \stopchoice \blank[6*big] \item 0 \startchoice \item 0 \item 0 \item 0 \item 0 \stopchoice \item 0 \startchoice \item 0 \item 0 \item 0 \item 0 \stopchoice \item 0 \startchoice \item 0 \item 0 \item 0 \item 0 \stopchoice \blank[6*big] \item 0 \startchoice \item 0 \item 0 \item 0 \item 0 \stopchoice \item 0 \startchoice \item 0 \item 0 \item 0 \item 0 \stopchoice \item 0 \startchoice \item 0 \item 0 \item 0 \item 0 \stopchoice \item 0 \startchoice \item 0 \item 0 \item 0 \item 0 \stopchoice \item 0 \startchoice \item 0 \item 0 \item 0 \item 0 \stopchoice \stopitemize \stoptext test.log: open source > level 1, order 1, name '/home/me/apps/texlive/2021/texmf-dist/tex/context/base/mkiv/cont-yes.mkiv' system > system > ConTeXt ver: 2021.03.05 19:11 MKIV fmt: 2021.4.24 int: english/english system > system > 'cont-new.mkiv' loaded open source > level 2, order 2, name '/home/me/apps/texlive/2021/texmf-dist/tex/context/base/mkiv/cont-new.mkiv' system > beware: some patches loaded from cont-new.mkiv close source > level 2, order 2, name '/home/me/apps/texlive/2021/texmf-dist/tex/context/base/mkiv/cont-new.mkiv' system > files > jobname 'test', input './test', result 'test' fonts > latin modern fonts are not preloaded languages > language 'en' is active open source > level 2, order 3, name '/home/me/code/qs-cs/test.tex' fonts > preloading latin modern fonts (second stage) fonts > 'fallback modern-designsize rm 12pt' is loaded backend > xmp > using file '/home/me/apps/texlive/2021/texmf-dist/tex/context/base/mkiv/lpdf-pdx.xml' pages > flushing realpage 1, userpage 1, subpage 1 pages > flushing realpage 2, userpage 2, subpage 2 ! error: (nodes): fuzzy token cleanup in whatsit node with type whatsit and subtype 29 Could anyone reproduce or explain this bug? Thanks! Sylvain