Dear all, after installing the latest beta I tried to compile my old sources, but the metapost pass called from within a pdfetex run stopped with the error message: ! Equation cannot be performed (numeric=boolean). <to be read again> ; l.24 spotcolors := true ; Looking at the mpgraph file I see the following line: if unknown context_spec : input mp-spec ; fi ; and in my version of mp-spec spotcolors is declared to be boolean. Indeed, when I run 'mpost filename-mpgraph' I get no error message and all mp-* files are included. Any hint on where context_spec et al are set? Groet Johannes -- Johannes Hüsing There is something fascinating about science. One gets hannes@ruhrau.de such wholesale returns of conjecture from such a trifling investment of fact. Mark Twain