Internally, what's different in spawned processes from normally-started ones?

[Lindley]

I have a program which is hanging on an OpenGL setup call when I spawn it from another process using CreateProcess, but behaving just fine when I start it normally. Any idea what might be wrong?

The specific call is
config = gdk_gl_config_new_by_mode (GdkGLConfigMode(GDK_GL_MODE_RGB | GDK_GL_MODE_DOUBLE));
using GtkGLExt.

[Lindley]

Nevermind, it turned out to be a pipe I was ignoring. Once the stderr buffer got full, everything just ground to a halt.....