Dear list, I noticed, that even though I set \version[temporary] to make overfull boxes visible, they were not marked with an overfullrule in the bibliography. Below you find a minimal example which reproduces the problem on TL 2016. First I typeset the entry by hand where the black rectangle shows up in the margin, then I format it automatically using \placelistofpublications where no box is shown. How can I have overfull boxes highlighted in the bibliography? Many thanks, Henri --- \startbuffer[biblio] @article{Heisenberg1926, author = {Heisenberg, W.}, title = {Mehrk\"orperproblem und Resonanz in der Quantenmechanik}, journal = {Zeitschrift f\"ur Physik}, year = {1926}, volume = {38}, number = {6}, pages = {411--426}, issn = {0044-3328}, doi = {10.1007/BF01397160}, url = {http://dx.doi.org/10.1007/BF01397160} } \stopbuffer \version[temporary] \setuppapersize[A5][A5] \usebtxdataset[biblio.buffer] \usebtxdefinitions[aps] \starttext \showframe \setupitemize[left={[},right={]},width=3em,stopper=] \startitemize[n] \item W. Heisenberg, Mehrkörperproblem und Resonanz in der Quantenmechanik, {\em Zeitschrift für Physik} {\bf 38}(6), 411--426 (1926). \stopitemize \nocite[Heisenberg1926] \placelistofpublications \stoptext