Hi Hans, overprinting is broken under very special conditions. You need to add framed content with a defined mp overlay as background and *deactivated frame* to a layer (last of the four pairs in the example). The text of the last pair is written in the same \GSoverprint group (in this case the \GSknockout is even missing). Very obscure. Have fun, Peter \setupcolors[state=start] \setuppagenumber[state=stop] \pdfcompresslevel=0 \pdfobjcompresslevel=0 \startuniqueMPgraphic{FOO} fill OverlayBox withcolor lightgray; \stopuniqueMPgraphic \defineoverlay[FOO][\uniqueMPgraphic{FOO}] \definelayer[BAR] \starttext % OK \setlayer[BAR][x=0mm,y=0mm] {\framed[background=color,backgroundcolor=lightgray,frame=off] {\startoverprint first one\stopoverprint}} \setlayer[BAR][x=50mm,y=0mm] {\framed[background=color,backgroundcolor=lightgray,frame=off] {\startoverprint second one\stopoverprint}} % OK \setlayer[BAR][x=0mm,y=15mm] {\framed[background=color,backgroundcolor=lightgray,frame=on] {\startoverprint first one\stopoverprint}} \setlayer[BAR][x=50mm,y=15mm] {\framed[background=color,backgroundcolor=lightgray,frame=on] {\startoverprint second one\stopoverprint}} % OK \setlayer[BAR][x=0mm,y=30mm] {\framed[background=FOO,frame=on] {\startoverprint first one\stopoverprint}} \setlayer[BAR][x=50mm,y=30mm] {\framed[background=FOO,frame=on] {\startoverprint second one\stopoverprint}} % ( layer + overlay + frame=off ) is buggy \setlayer[BAR][x=0mm,y=45mm] {\framed[background=FOO,frame=off] {\startoverprint first one\stopoverprint}} \setlayer[BAR][x=50mm,y=45mm] {\framed[background=FOO,frame=off] {\startoverprint second one\stopoverprint}} \flushlayer[BAR] \stoptext