Thomas A. Schmitz wrote:
Hi Hans,

the bad news is that transparent colors don't work at all in the latest
beta with mkiv (they worked on and off with the beta before that). The good
news is that this makes it easier to build a minimal example :-) Here comes:

\setupcolors[state=start]

\starttext

\startuseMPgraphic{test}
pair a, b, c, d ;
a = (0,0) ; b = (0,5cm) ; c = (5cm,5cm) ; d = (5cm,0) ;
path p ; p = a -- b -- c -- d -- cycle ;
draw a -- c withcolor black ;
fill p withcolor transparent (1,0.25,red) ;
\stopuseMPgraphic

\useMPgraphic{test}

\stoptext

has to do with a confused page state (side effect of new numbering code)

you can try the beta (maybe other bugs were introduced now)

Hans


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