I am interested in using metafont, and working through the initial steps.
When I use the simple command drawdot (35,70); showit; a blank (white) window is opened with the title "METAFONT Screen (768 x 1024)", but then I get a window to say that metafont has reported that "a problem caused the program to stop working correctly" and it terminates.
Environment: Windows 10, METAFONT, Version 2.7182818 (MiKTeX 2.9.6500 64-bit)
I invoke metafont with mf --interaction=errorstopmode --screen
The issue has been logged and acknowledged on github.