(I wonder if the live context has been having the same problem?)
I tried to fix it after Taco reported the exact problem. Plese test if it's working now.
Thanks, the live context works! I tested this file: \setupcolors[state=start] \starttext \startreusableMPgraphic{a} fill fullcircle scaled 10cm withcolor transparent(1,0.5,green) ; \stopreusableMPgraphic \placefigure[force,none]{}{\reuseMPgraphic{a}} \stoptext and a nice transparent green circle shows up. I also tested (overlapping transparent squares): \setupcolors[state=start] \starttext \startreusableMPgraphic{a} fill unitsquare scaled 1cm withcolor yellow; fill unitsquare shifted (0.5,0.5) scaled 1cm withcolor transparent(1,0.5,red); \stopreusableMPgraphic \placefigure[force,none]{}{\reuseMPgraphic{a}} \stoptext and it now works. -Sanjoy `Never underestimate the evil of which men of power are capable.' --Bertrand Russell, _War Crimes in Vietnam_, chapter 1.