Dear List Members, Thanks for the responses from Alexander Gottwald and Reid Thompson. Before I could try their suggestions out, I had a crash and had to reinstall Cygwin. While doing so, I noticed that the User's Guide suggested starting Cygwin-X with the MS-DOS batch file startxwin.bat rather than with xinit. Now everything works just fine and I see the cube from "cube.c"!
Larry Griffith
