Hi All  I think a bug has appeared quite recently in the command, lmt_shade. A MWE below followed by the error output. Best Wishes Keith McKay \setuppapersize[A4,landscape][A4,landscape] \starttext \startMPpage StartPage; width := PaperWidth ; height := PaperHeight ; unit := cm ; definecolor [ name = "MyColor1", r = 0.781, g = 0.5, b = 0.5 ] ; definecolor [ name = "MyColor3", r = 1, g = 1, b = 0.7983 ] ; draw lmt_shade [ path = unitsquare xscaled width yscaled height, direction = "up", alternative = "linear", colors = { "MyColor1", "MyColor3" }, ] ; StopPage; \stopMPpage \stoptext %%%Error Log%%% system > system > ConTeXt ver: 2021.03.13 11:22 LMTX fmt: 2021.3.16 int: english/english system > system > 'cont-new.mkxl' loaded <snip> metapost > initializing instance 'metafun:1' using format 'metafun' and method 'default' metapost > loading 'metafun' as 'metafun.mpxl' using method 'default' metapost > initializing number mode 'scaled' metafun > log > metafun > log > error: Not a cycle metafun > log > metapost > log > <to be read again> metapost > log > withprescript metapost > log > <argument> ...asparameter"vector":center_a:=point(getparameter"vector"1)of.mfun_shade_path;center_b:=point(getparameter"vector"2)of.mfun_shade_path;fi.fill.mfun_shade_path.withprescript metapost > log > "sh_domain="... metapost > log > image->begingroup.save.currentpicture;picture.currentpicture;currentpicture:=nullpicture;(TEXT3) metapost > log > ;currentpicture.if.str(SUFFIX2)<>"":shifted(mfun_labxf(SUFFIX2)*lrcorner.p+mfun_labyf(SUFFIX2)*ulcorn... metapost > log > lmt_do_shade->...ve="circular":draw.fullcircle.scaled(radius_a)shifted.center_a.dashed.evenly;draw.fullcircle.scaled(factor*radius_b)shifted-center_b.dashed.evenly;fi.fi.popparameters;) metapost > log > endgroup metapost > log > <scantokens> lmt_do_shade metapost > log > metapost > log > <*> ...3", r = 1, g = 1, b = 0.7983 ] ; draw lmt_shade [ path = unitsquare xscaled width yscaled height, direction = "up", alternative = "linear", colors = { "MyColor1", "MyColor3" }, ] metafun > log > metafun > log > That contour should have ended with '.. cycle' or '& cycle'. So I'll not change anything just now. metafun > log > metapost > log > ; StopPage; ; metapost > log >