I always have my problem with mpost (MiKTeX 2.1, ConTeXt 2.5). When I try to compile a ppchtex file I get :

-Randomizer initialized to 1493581758.
-system(mpost -progname=mpost -mem=metafun glucose-mpgraph)...disabled.

-
-figures : figure glucose-mpgraph can not be found

Mpost seems to be disabled, where can I enable it?

Hervé