I compared two systems:
WinME, Athlon, GForce2MX: OpenGL works.
WinXP, PIII, Sis 630: OpenGL doesn\'t work.
Both have latest drivers.
On XP this line appears several times in psclient.txt:
crystalspace.graphics3d.opengl: GL reported error for glTexImage2D(): enum argument out of range
Not so on WinME.
Temar